Modifying a style of bib

Question

I need to modify this style s.t. the call of a reference on text appear with braquets instead of parenteses. Indeed, I'd like to get bf at the principal title of reference at bibliography. Could someone help me?

https://github.com/manoelcampos/ft-unb-latex-template/blob/master/abnt-num.bst

 \documentclass[ english,brazil]{abntbibufjf}
    \usepackage{lmodern}                        
    \usepackage[T1]{fontenc}        
    \usepackage[utf8]{inputenc}
    \usepackage{lastpage}           
    \usepackage{indentfirst}        
    \usepackage{color}          
    \usepackage{graphicx}           
    \usepackage{microtype} 
    \usepackage[square]{natbib}

    \titulo{A definir} 
    \subtitulo{a definir}  
    ...


    \begin{document}
    ...
    \begin{agradecimentos}
    Agrade\c{c}o aos ... 
    \end{agradecimentos}

    \begin{epigrafe} 
        ''E tudo o que fizerdes, seja em palavra, seja em ação, fazei-o em nome
do Senhor Jesus, dando por ele graças a Deus Pai.'' Colossenses 3:17. 
    \end{epigrafe}

    ...
    \chapter{NOME DO CAP\'ITULO}
    Segundo \citep{chapiro2016numerical}...

    ...

  ...

   ...

   ...

    \section{ELEMENTOS P\'OS-TEXTUAIS}
...

    \postextual 
    \bibliographystyle{abnt-num}
    \bibliography{ref.bib}
   ...

---

%% abntbibufjf.cls, v-2 JB-LP-LA
%% 
  %% Copyright 2014 Jos\'e Barbosa (ICE-UFJF), Larissa Pinheiro (CDC-UFJF), L\'ivia Alonso (CDC-UFJF).
  %
  % This work may be distributed and/or modified under the
  % conditions of the LaTeX Project Public License, either 
  % version 1.3 of this license or (at your option) any later 
  % version. The latest version of this license is in
  %       http://www.latex-project.org/lppl.txt
  % and version 1.3 or later is part of all distributions of LaTeX
  % version 2005/12/01 or later.
  %
  % This work has the LPPL maintenance status `maintained'.
  % 
  % The Current Maintainer of this work is Jos\'e Barbosa (ICE-UFJF).
  %
  % This work consists of the files abntbibufjf.cls.
% 
% 
%  
% ------------------------------------------------------------------------
% ------------------------------------------------------------------------
%%Os acentos foram desprezados neste arquivo.
%
\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{abntbibufjf}[2019/09/05 v 2]


\RequirePackage{ifthen}


\DeclareOption*{%
  \PassOptionsToClass{\CurrentOption}{memoir}%
}
\ProcessOptions\relax
\LoadClass[12pt,a4paper]{memoir}

% ------------------------------------------------------------------------


\newcommand{\ifnotempty}[2]{\ifthenelse{\not\equal{#1}{}}{#2}{}} 

\RequirePackage[hypertexnames=false, hidelinks]{hyperref}    
\pdfstringdefDisableCommands{\def\\{, }\def\and{; }}

\RequirePackage{bookmark}               

\RequirePackage[brazil]{babel}

\RequirePackage{enumitem}

\RequirePackage{calc} 

%
\newcommand{\folhaderostoname}{Folha de rosto}
\newcommand{\epigraphname}{Ep\'igrafe}
\newcommand{\dedicatorianame}{Dedicat\'oria}
\newcommand{\agradecimentosname}{\bfseries AGRADECIMENTOS}
\newcommand{\anexoname}{\bfseries ANEXO}
\newcommand{\anexosname}{Anexos}
\newcommand{\apendicename}{\bfseries AP\^ENDICE}
\newcommand{\apendicesname}{Ap\^endices}
\newcommand{\orientadorname}{Orientador:}
\newcommand{\coorientadorname}{Coorientador:}
\newcommand{\folhadeaprovacaoname}{\bfseries FOLHA DE APROVA\c{C}\~AO}
\newcommand{\resumoname}{RESUMO} 
\newcommand{\listadesiglasname}{\bfseries LISTA DE ABREVIATURAS E SIGLAS}
\newcommand{\listadesimbolosname}{\bfseries LISTA DE S\'IMBOLOS}
\newcommand{\fontename}{Fonte}
\newcommand{\notaname}{Nota}
%% --
\addto\captionsbrazil{% 
  \renewcommand{\contentsname}{\bfseries SUM\'ARIO} %%
  \renewcommand{\bibname}{\bfseries REFER\^ENCIAS}
  \renewcommand{\indexname}{\bfseries \'INDICE}
  \renewcommand{\listfigurename}{\bfseries LISTA DE ILUSTRA\c{C}\~{O}ES}
  \renewcommand{\listtablename}{\bfseries LISTA DE TABELAS}
}

%% --
\def\au@classname{abntbibufjf} 


\newif\if@eu@ilhookcalled\@eu@ilhookcalledfalse
\newif\if@eu@hasil\@eu@hasilfalse

\def\au@eu@ilaux{\global\@eu@hasiltrue}
\def\au@eu@ilhook{%
  \if@eu@ilhookcalled\else
    \global\@eu@ilhookcalledtrue
    \global\@eu@hasiltrue
    \immediate\write\@auxout{%
      \string\au@eu@ilaux{}^^J
    }%
    \typeout{* \au@classname: Il }%
  \fi
}
\newcommand{\auaddilcmd}[1]{%
  \begingroup
  \let\au@temp#1
  \expandafter\gdef\expandafter#1\expandafter{%
    \expandafter\au@eu@ilhook\au@temp}%
  \endgroup
}
\newcommand{\auaddilenv}[1]{%
  \begingroup
  \expandafter\auaddilcmd\expandafter{\csname#1\endcsname}%
  \endgroup
}
\AtBeginDocument{\auaddilenv{figure}}

% ------------------------------------------------------------------------

\setlrmarginsandblock{3cm}{2cm}{*}
\setulmarginsandblock{3cm}{2cm}{*}
\checkandfixthelayout

\OnehalfSpacing
\AtBeginDocument{\setlength{\afterchapskip}{\onelineskip}} 

%% ---

\setlength{\parindent}{1.3cm}

\setlength{\parskip}{4pt}

\setlength{\cftbeforechapterskip}{0pt} 

%% ---

% ------------------------------------------------------------------------

\newcommand{\chapterfont}{\rmfamily} 
\newcommand{\chapterfontsize}{\normalsize}

\newcommand{\partfont}{\chapterfont}
\newcommand{\partfontsize}{\chapterfontsize}

\newcommand{\sectionfont}{\chapterfont}
\newcommand{\sectionfontsize}{\normalsize}

\newcommand{\subsectionfont}{\sectionfont}
\newcommand{\subsectionfontsize}{\normalsize}

\newcommand{\subsubsectionfont}{\subsectionfont}
\newcommand{\subsubsectionfontsize}{\normalsize}

\newcommand{\subsubsubsectionfont}{\subsectionfont}
\newcommand{\subsubsubsectionfontsize}{\normalsize}

% ------------------------------------------------------------------------

\newcounter{bookmarkcounter} 
\setcounter{bookmarkcounter}{0}
\newcommand{\AUbookmarkthis}[1]{%
  \addtocounter{bookmarkcounter}{1}%
  \phantomsection\pdfbookmark[0]{#1}{chapterb\arabic{bookmarkcounter}}
}

\newcommand{\pretextualchapter}[1]{%
  \addtocounter{bookmarkcounter}{1}%
  \AUbookmarkthis{#1}%
  \chapter*[#1]{#1}%
  }
\provideboolean{apendiceousecao}      
\setboolean{apendiceousecao}{false}


% ------------------------------------------------------------------------


\renewcommand{\foottextfont}{\small}
\setlength{\footmarkwidth}{1.2em}
\setlength{\footmarksep}{0em}
\footmarkstyle{\footnotesize{\textsuperscript{#1}}\hfill}

  \counterwithout{figure}{chapter}
  \counterwithout{table}{chapter}
%%%}
%------------------------------------

\captiondelim{~\textendash ~} 
\captionnamefont{\normalsize}
\captiontitlefont{\normalsize}
\indentcaption{0pt} 
\captionstyle[\centering]{\centerlastline} 
\newcommand{\larguratexto}{\changecaptionwidth \captionwidth} 

\newcommand{\configureseparator}{\captiondelim{: }}

\newcommand{\fonte}[2][\fontename]{%
  \M@gettitle{#2}%
  \memlegendinfo{#2}%
  \par
  \begingroup
  \captionstyle{\raggedright}{\raggedright} 
     \@parboxrestore
     \if@minipage
       \@setminipage
     \fi
     \small
     \captiondelim{: }
     \@makecaption{\small 
     #1}{\ignorespaces \small 
     #2}\par
   \endgroup}



\AtEndPackage{caption}{
  \AtBeginDocument{%
    \DeclareCaptionLabelSeparator{dash}{~\textendash ~}
    \DeclareCaptionFont{normalsize}{\normalsize}
      \captionsetup{
                    labelseparator=dash,
                    }
      \renewcommand{\configurecaptions}{%
                  \captionsetup{
                                singlelinecheck=false}}
      \renewcommand{\configureseparator}{\captionsetup{labelsep=colon}}
  }
}

% ------------------------------------------------------------------------

\setsecnumdepth{paragraph}
\settocdepth{paragraph}
\setcounter{tocdepth}{5}
\setcounter{secnumdepth}{5}
\maxsecnumdepth{paragraph}

\newcommand{\subsubsubsection}{\paragraph}
\newcommand{\cftbeforesubsubsubsectionskip}{\cftbeforeparagraphskip}
\newcommand{\cftsubsubsubsectionfont}{\cftparagraphfont}
\newcommand{\setsubsubsubsecheadstyle}{\setparaheadstyle}

\setafterparaskip{1.0\onelineskip plus 0.5\onelineskip minus 0.2\onelineskip}
\setparaheadstyle{\normalfont\rmfamily\raggedright} 

%-------------------------------------------------------------------


\renewcommand{\cftfigurename}{\figurename\space} 
\renewcommand*{\cftfigureaftersnum}{\hfill \textendash \hfill} 
\renewcommand{\cftfigureafterpnum}{\cftparfillskip} 


\newcommand{\tipoilust}[1]{\renewcommand{\cftfigurename}{#1 \space}
\renewcommand{\figurename}{#1}
}

\newcommand{\ilustvaria}{
\renewcommand{\fnum@figure}{} 
}

\newcommand{\listilustvaria}{
\setlength{\cftfigurenumwidth}{24pt}
\setlength{\cftfigureindent}{0pt}
\begingroup
\renewcommand\numberline[1]{} 
\listoffigures*
\endgroup
}



\renewcommand{\cfttablename}{\tablename\space}
\renewcommand*{\cfttableaftersnum}{\hfill \textendash \hfill}   
\renewcommand{\cfttableafterpnum}{\cftparfillskip} 


\renewcommand{\tocheadstart}{\chapterfont}

\renewcommand*{\cftchapterdotsep}{\cftdotsep}

\setlength{\cftbeforechapterskip}{0pt plus 0pt}
\renewcommand*{\insertchapterspace}{}

\cftinsertcode{A}{}

\newlength{\cftlastnumwidth}
\setlength{\cftlastnumwidth}{\cftsubsubsectionnumwidth+1em}

\newcommand{\tocprintchapter}{}
\newcommand{\tocinnonumchapter}{}
\newcommand{\tocprintchapternonum}{}
\newcommand{\tocpartapendices}{}
\newcommand{\tocpartanexos}{}

  \cftinsertcode{A}{\renewcommand{\cftchapteraftersnum}{\hfill \textendash \hfill}}

  \cftsetindents{part}{0em}{\cftlastnumwidth}
  \cftsetindents{chapter}{0em}{\cftlastnumwidth}
  \cftsetindents{section}{0em}{\cftlastnumwidth}
  \cftsetindents{subsection}{0em}{\cftlastnumwidth}
  \cftsetindents{subsubsection}{0em}{\cftlastnumwidth}
  \cftsetindents{paragraph}{0em}{\cftlastnumwidth}
  \cftsetindents{subparagraph}{0em}{\cftlastnumwidth}

  \renewcommand{\tocprintchapter}{%
    \addtocontents{toc}{\cftsetindents{chapter}{0em}{\cftlastnumwidth}}}

  \renewcommand{\tocinnonumchapter}{%
    \addtocontents{toc}{\cftsetindents{chapter}{\cftlastnumwidth}{2em}}%
    \cftinserthook{toc}{A}}

  \renewcommand{\tocprintchapternonum}{%
    \addtocontents{toc}{\cftsetindents{chapter}{\cftlastnumwidth}{2em}}}

  \renewcommand{\tocpartapendices}{%
    \addtocontents{toc}{\cftsetindents{part}{\cftlastnumwidth}{2em}}
    \cftinserthook{toc}{A}}

  \renewcommand{\tocpartanexos}{%
    \addtocontents{toc}{\cftsetindents{part}{\cftlastnumwidth}{2em}}
    \cftinserthook{toc}{A}}


\newcommand{\phantompart}{%
  \bookmarksetup{startatroot}
  \phantomsection
}
% ------------------------------------------------------------------------

\provideboolean{innonumchapter}  
\setboolean{innonumchapter}{true}
\makechapterstyle{abnt}{%
  \renewcommand{\chapterheadstart}{} 

  \ifx \chapternamenumlength \undefined
    \newlength{\chapternamenumlength}
  \fi

     \setlength{\beforechapskip}{0pt}
     \renewcommand{\chaptitlefont}{\chapterfont\chapterfontsize}
%%%   }

  \renewcommand{\chapnumfont}{\chaptitlefont}
  \renewcommand{\parttitlefont}{\partfont\partfontsize}
  \renewcommand{\partnumfont}{\partfont\partfontsize}
  \renewcommand{\partnamefont}{\partfont\partfontsize}


  \setsecheadstyle{\sectionfont\sectionfontsize
  }
  \setsubsecheadstyle{\subsectionfont\subsectionfontsize
  }
  \setsubsubsecheadstyle{\subsubsectionfont\subsubsectionfontsize
  }
  \setsubsubsubsecheadstyle{\subsubsubsectionfont\subsubsubsectionfontsize
  }

  \renewcommand{\chapternamenum}{}

  \renewcommand{\printchaptername}{%
   \chaptitlefont
   \ifthenelse{\boolean{apendiceousecao}}{\appendixname}{}%
  }

  \def\printchaptertitle##1{%
    \chaptitlefont%
    \ifthenelse{\boolean{innonumchapter}}{\centering
    {##1}}{%
    % else  
      \ifthenelse{\boolean{apendiceousecao}}{\centering%
        \settowidth{\chapternamenumlength}{\printchaptername\printchapternum\afterchapternum}%
        {##1}%
      }{%
        \settowidth{\chapternamenumlength}{\printchaptername\printchapternum\afterchapternum}%
        \parbox[t]{\columnwidth-\chapternamenumlength}{%
        {##1}}}%
    }    
  }

  \renewcommand{\printchapternum}{%
     \tocprintchapter
     \setboolean{innonumchapter}{false}
     \bfseries %%
     \chapnumfont%
     \space\thechapter\space%
     \ifthenelse{\boolean{apendiceousecao}}{%
       \tocinnonumchapter
       \space--\space%
     }{} % 
  }
  \renewcommand{\afterchapternum}{}


  \renewcommand\printchapternonum{%
     \tocprintchapternonum
     \setboolean{innonumchapter}{true}%
    }
}
\chapterstyle{abnt}


\makepagestyle{abntchapfirst}
\makeoddhead{abntchapfirst}{}{}{\small\thepage}

% ------------------------------------------------------------------------

\newcommand{\pretextual}{%
  \aliaspagestyle{chapter}{empty}
  \pagestyle{empty}
  \aliaspagestyle{cleared}{empty}
  \aliaspagestyle{part}{empty}
}
\renewcommand{\frontmatter}{\pretextual} 

\AtBeginDocument{\pretextual}

% ------------------------------------------------------------------------

\newcommand{\titulo}[1]{\title{#1}}
\newcommand{\inseretitulo}{\thetitle}

\newcommand{\autor}[1]{\author{#1}}
\newcommand{\insereautor}{\theauthor}

\let\olddate\date
\renewcommand{\date}[1]{\AtBeginDocument{\olddate{#1}}}
\newcommand{\data}[1]{\date{#1}}
\newcommand{\inseredata}{\thedate}

\providecommand{\insereinstituicao}{}
\newcommand{\instituicao}[1]{\renewcommand{\insereinstituicao}{#1}}

\providecommand{\inserefaculdade}{}
\newcommand{\faculdade}[1]{\renewcommand{\inserefaculdade}{#1}}

\providecommand{\inserelocal}{}
\newcommand{\local}[1]{\renewcommand{\inserelocal}{#1}}

\providecommand{\inserenatureza}{}
\newcommand{\natureza}[1]{\renewcommand{\inserenatureza}{#1}}

\providecommand{\insereobjeto}{}
\newcommand{\objeto}[1]{\renewcommand{\insereobjeto}{#1}}

\providecommand{\insereprograma}{}
\newcommand{\programa}[1]{\renewcommand{\insereprograma}{#1}}

\providecommand{\inseresubtitulo}{}
\newcommand{\subtitulo}[1]{\renewcommand{\inseresubtitulo}{#1}}

\providecommand{\inserefinalcatalog}{}
\newcommand{\finalcatalog}[1]{\renewcommand{\inserefinalcatalog}{#1}}

\providecommand{\insereautorR}{}
\newcommand{\autorR}[1]{\renewcommand{\insereautorR}{#1}}

\providecommand{\insereorientadorOU}{}
\providecommand{\insereorientador}{}
\newcommand{\orientador}[2][\orientadorname]%
  {\renewcommand{\insereorientadorOU}{#1}%
   \renewcommand{\insereorientador}{#2}}

\providecommand{\inserecoorientadorOU}{}
\providecommand{\inserecoorientador}{}
\newcommand{\coorientador}[2][\coorientadorname]%
  {\renewcommand{\inserecoorientadorOU}{#1}%
   \renewcommand{\inserecoorientador}{#2}}

\providecommand{\insereorientadorTitulo}{}
\newcommand{\orientadorTitulo}[1]{\renewcommand{\insereorientadorTitulo}{#1}}

\providecommand{\inserecoorientadorTitulo}{}
\newcommand{\coorientadorTitulo}[1]{\renewcommand{\inserecoorientadorTitulo}{#1}}   


% ------------------------------------------------------------------------

\newenvironment{capa}{\begin{titlingpage}}{\end{titlingpage}\cleardoublepage}

\newcommand{\inserecapa}{%
  \begin{capa}%
   \begin{center}
    {\chapterfont \bfseries \MakeUppercase{\insereinstituicao} \par \MakeUppercase{\inserefaculdade} \par \MakeUppercase{\insereprograma}}
    \vfill
    {\chapterfont \bfseries \insereautor}
    \vfill
    \chapterfont{\bfseries \inseretitulo \mdseries \ifnotempty{\inseresubtitulo}{\textbf{:} \inseresubtitulo}}
    \vfill
    \inserelocal \par \inseredata 
   \end{center}
   \end{capa}
}

\newenvironment{folhaderosto}[1][\folhaderostoname]{\clearpage\AUbookmarkthis{#1}}{\newpage}%

%% --
\newcommand{\folhaderostocontent}{
  \begin{center}
    {\chapterfont \bfseries \insereautor} 
    \vspace*{\fill}
    \begin{center}
      {\chapterfont \bfseries \inseretitulo \mdseries 
        \ifnotempty{\inseresubtitulo}{\textbf{:} \inseresubtitulo}}
    \end{center}
    \vspace*{\fill}
      \ifnotempty{\inserenatureza}{%
      \hspace{.45\textwidth}
      \begin{minipage}{.5\textwidth}
        \SingleSpacing
         \inserenatureza
      \end{minipage}
       \vspace*{\fill}
    }
  \end{center} 
   {\insereorientadorOU ~\insereorientadorTitulo ~\insereorientador \par }
    \ifnotempty{\inserecoorientador}{%
       {\inserecoorientadorOU ~\inserecoorientadorTitulo ~\inserecoorientador}
    }
    \vfill
  \begin{center}  
    \inserelocal \par \inseredata   
  \end{center}
}
%% --

\newcommand{\inserefolhaderosto}[1]{%
  \begin{folhaderosto}{#1}
     \folhaderostocontent
  \end{folhaderosto}}


%% --
\newcommand{\inserecatalog}{
\thispagestyle{empty}

\ifthenelse{\boolean{@twoside}}
{}
{\addtocounter{page}{-1}}

{
\vspace*{15cm}
\begin{center}
\begin{minipage}[c]{13cm}
\begin{center}
Ficha catalogr\'afica elaborada atrav\'es do Modelo Latex do CDC da UFJF com os dados fornecidos pelo(a) autor(a)
\end{center}
\end{minipage}

\fbox{\hspace*{0.3cm} \begin{minipage}[c]{12.5cm} \SingleSpacing \small
  \insereautorR . \par
  \hspace*{0.45cm} \inseretitulo \ifnotempty{\inseresubtitulo}{ : \inseresubtitulo} ~/ \insereautor. \textendash ~\inseredata .\par
  \hspace*{0.5cm} \pageref{LastPage} f. \if@eu@hasil : il.~\fi \\[12pt]
  \hspace*{0.45cm} \insereorientadorOU ~\insereorientador \par
    {\ifnotempty{\inserecoorientador}{%
       {\hspace*{0.45cm} \inserecoorientadorOU ~\inserecoorientador \par }%
    }
   }
  \hspace*{0.45cm} \insereobjeto ~\textendash ~\insereinstituicao , \inserefaculdade . \insereprograma , \inseredata . \\[12pt]
  \hspace*{0.5cm}  \inserefinalcatalog 
  \vspace*{12pt}
  \hspace*{0.3cm}
\end{minipage} \hspace*{0.3cm}}
\end{center}}
}


\newcommand{\inicfolhaaprov}{
\begin{center}
    {\chapterfont \bfseries \insereautor}

    \vfill
    \begin{center}
      {\chapterfont\bfseries\inseretitulo \mdseries \ifnotempty{\inseresubtitulo}{\textbf{:} \inseresubtitulo}}
    \end{center}
    \vfill

    \hspace{.45\textwidth}
    \begin{minipage}{.5\textwidth}
        \inserenatureza
    \end{minipage}%
    \vfill
   \end{center}
}

%%%


\newenvironment{folhadeaprovacao}[1][\folhadeaprovacaoname]{%
   \clearpage%
   \AUbookmarkthis{#1}%
   \begin{Spacing}{1.0}
}{\end{Spacing}%
\cleardoublepage}

\newenvironment{dedicatoria}[1][]{%
   \ifthenelse{\equal{#1}{}}{%
    \AUbookmarkthis{\dedicatorianame}
    }{\pretextualchapter{#1}}
    \vspace*{\fill} 
    \begin{quote}
    \addtolength{\leftskip}{4cm}
  }{%
    \end{quote}
  \cleardoublepage}

\newenvironment{agradecimentos}[1][\agradecimentosname]{%
   \pretextualchapter{#1}
  }{%
  \cleardoublepage}

\newenvironment{epigrafe}[1][]{%
   \ifthenelse{\equal{#1}{}}{%
    \AUbookmarkthis{\epigraphname}
    }{\pretextualchapter{#1}}
    \vspace*{\fill}
    \begin{quote}
    \addtolength{\leftskip}{4cm}
    }{%
  \end{quote}
  \cleardoublepage}

    \setlength\absleftindent{0cm}
    \setlength\absrightindent{0cm}
     \renewcommand{\abstracttextfont}{\normalfont\normalsize}

\newenvironment{resumo}[1][\resumoname]{%
   \AUbookmarkthis{#1}
   \renewcommand{\abstractnamefont}{\chaptitlefont}
   \renewcommand{\abstractname}{\bfseries 
   {#1}}
   \begin{abstract}
  }{\end{abstract}%
\cleardoublepage}


\newenvironment{siglas}{%
  \pretextualchapter{\listadesiglasname}
  \begin{symbols} 
  \setlength{\itemsep}{-0.5em} 
  }{
  \end{symbols}
  \cleardoublepage
  }


\newenvironment{simbolos}{%
  \pretextualchapter{\listadesimbolosname}
\begin{symbols} 
\setlength{\itemsep}{-0.5em} 
}{%
\end{symbols}
  \cleardoublepage
}


\newenvironment*{citacao}[1][default]{%
   \list{}%
   \small%
   \addtolength{\leftskip}{4cm}%{\citacaorecuo}%
   \item[]%
   \begin{SingleSpace}%
   \ifthenelse{\not\equal{#1}{default}}{\itshape\selectlanguage{#1}}{}%
 }{%
   \end{SingleSpace}%
   \endlist}%

%% --
\newlist{alineas}{enumerate}{1}
\setlist[alineas,1]{label={\alph*)},topsep=0pt,itemsep=0pt,leftmargin=\parindent+\labelwidth-\labelsep}%
\newlist{subalineas}{enumerate}{1}
\setlist[subalineas,1]{label={--},topsep=0pt,itemsep=0pt,leftmargin=*}%
%% --

\newlength{\signwidth} 
\setlength{\signwidth}{10cm} 
\newlength{\signthickness} 
\setlength{\signthickness}{1pt}
\newlength{\signskip} 
\setlength{\signskip}{1cm} 

\newcommand{\assinatura}[1]{
  \begingroup\par\centering 
  \parbox[t]
  {\signwidth}{\SingleSpacing\vspace*{\signskip}\centering%
  \rule{\signwidth}{\signthickness}\\%
  \nopagebreak #1\par}
  \par\endgroup}

% ------------------------------------------------------------------------

\newcommand{\textual}{%
    \pagestyle{simple} 
    \aliaspagestyle{chapter}{abntchapfirst}
  \nouppercaseheads%
  \bookmarksetup{startatroot}% 
\aliaspagestyle{cleared}{simple} 
  }
\renewcommand{\mainmatter}{\textual}

% ------------------------------------------------------------------------

\newcommand{\postextual}{\phantompart}
\renewcommand{\backmatter}{\postextual}

%---

\newcommand*{\sistautordata}{\usepackage[authoryear, round]{natbib} 
\setlength{\bibhang}{0pt}   
\renewcommand*{\bibfont}{\raggedright}  
}

\let\oldthebibliography=\thebibliography
\let\endoldthebibliography=\endthebibliography
\renewenvironment{thebibliography}[1]{%
\setlength{\afterchapskip}{\lineskip}
\renewcommand*{\biblistextra}{\raggedright}
\begin{oldthebibliography}{#1}%
\begin{SingleSpacing}
}%
{%
\end{SingleSpacing}
\end{oldthebibliography}%
}
%%---

\newcommand\@switch[1]{ \@writefile{toc}{\renewcommand*{\cftappendixname}{#1 \space}} }
\newcommand{\switchchapname}[1]{ \protected@write \@auxout {}{\string\@switch{#1} }}

\newcommand{\AUapendiceconfig}[2]{%
 \setboolean{apendiceousecao}{true}%
 \renewcommand{\appendixname}{#1}
 \renewcommand{\appendixpagename}{#2}
 \renewcommand{\appendixtocname}{#2}

 \switchchapname{#1}
 \renewcommand*{\cftappendixname}{#1 \space}
}

\newenvironment{apendicesenv}{%
 \AUapendiceconfig{\apendicename}{\apendicesname}
 \begin{appendix}
}{
 \end{appendix}
 \setboolean{apendiceousecao}{false}
 \bookmarksetup{startatroot}
}

\newenvironment{anexosenv}{%
 \cftinserthook{toc}{AAA}

 \AUapendiceconfig{\anexoname}{\anexosname}
 \begin{appendix}
 \renewcommand\theHchapter{anexochapback.\arabic{chapter}}
}{
 \end{appendix}
 \setboolean{apendiceousecao}{false}
 \bookmarksetup{startatroot}
}

% --- 

Edit

The brackets are OK thanks the comment of Mico. I just would like to know how to get bold at the title of entries now. Using this style I get:

I would like to get boldface on the title I've painted with yellow.

The .bib entry is:

@article{chapiro2016numerical,
  title={Numerical solution of a class of moving boundary problems with a nonlinear complementarity approach},
  author={Chapiro, Grigori and Gutierrez, Angel ER and Herskovits, Jos{\'e} and Mazorche, Sandro R and Pereira, Weslley S},
  journal={Journal of Optimization Theory and Applications},
  volume={168},
  number={2},
  pages={534--550},
  year={2016},
  publisher={Springer}
}

Answer 1

Use the right tools: I think you should take a look on Bibulous

a drop-in replacement for BibTeX that makes use of style templates instead of BibTeX’s BST language.

It is based on templates, and it is developed to solve such a problem.

Bibulous developed out of frustration with the complexity of creating bibliography styles using BibTeX’s obscure language, ...

Take a look on the examples on their page.

EDIT: here is a MWE using bibulous to achieve what the OP needs.

mwe.tex :

\documentclass [11pt]{article}
\begin{document}
\nocite{chapiro2016numerical}
\bibliographystyle{mystyle}
\bibliography{./mybib}
\end{document} 

mybib.bib :

@article{chapiro2016numerical,
  title={Numerical solution of a class of moving boundary problems with a nonlinear complementarity approach},
  author={Chapiro, Grigori and Gutierrez, Angel ER and Herskovits, Jos{\'e} and Mazorche, Sandro R and Pereira, Weslley S},
  journal={Journal of Optimization Theory and Applications},
  volume={168},
  number={2},
  pages={534--550},
  year={2016},
  publisher={Springer}
}

mystyle.bst:

TEMPLATES:
article = \uppercase{<au>} \textbf{<title>}. \textit{<journal>},<publisher>, v. <volume>, n. <number>, p. <pages>, <year>.

OPTIONS:
maxauthors = 1 
namelist_format = last_name_first
etal_message =  \lowercase{ et al.}

this file is the one you should create and customize (follow bibliography style templates). I this example I used the .bib provided by OP. For real case the template should include rules for books, proceeding, ...

my working folder tree is:

.
├── main.tex
├── mybib.bib
└── mystyle.bst

Download bibulous.py, make it executable (chmod +x bibulous), then invoke the following commands in the working directory:

 pdflatex main.tex            # this will creat .aux file
 /path/to/bibulous.py main.aux
 pdflatex main.tex

Of course, you need a working python 3 installation.

Here is the result:

Hoping that would help.

EDIT2: uppercase author name, lastname first

Answer 2

Be aware that the class you're using is a patchwork of code copied from abntex2 without acknowledgement and further complicated, ppgccufmg, this answer here and maybe more, so weird things may occur along the way (or not). Besides, it doesn't even use bibtex, not to mention biblatex, for bibliography management.

Another caveat: you should not do any of this (i.e., change the bibliography format) if you wish to follow ABNT rules because those rules are against what you want to do: see NBR 6023, "7.5.3 Artigo e/ou matéria de revista, boletim etc.". The logic is that an article is a part of a whole publication (just as in chapters of books). So it's just plain wrong to do this if you want to follow ABNT rules (and the UFJF exampe), and you'd have to highlight article titles and journal titles differently (as in bold vs. italics).

And now the full answer:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[brazil]{babel}

\begin{filecontents}{test.bib}
@article{article,
    journaltitle = {The Journal},
    pages = {22-24},
    title = {The title},
    volume = {5},
    year = {2005},
    author={John Doe}}    

\end{filecontents}

\usepackage[style=abnt-numeric,ittitles]{biblatex}
\addbibresource{test.bib} % if you’re using biblatex

\DeclareFieldFormat
[article]
{title}{\textbf{#1}}


%%%%%if you want brackets in text and bibliography%%%%%%%%%%
\DeclareFieldFormat{labelnumberwidth}{\mkbibbrackets{#1}}
\DeclareFieldFormat{shorthandwidth}{\mkbibbrackets{#1}}

\DeclareCiteCommand{\cite}[\mkbibbrackets]
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\DeclareMultiCiteCommand{\cites}[\mkbibbrackets]{\cite}{\multicitedelim}

\DeclareCiteCommand{\parencite}[\mkbibbrackets]
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\DeclareMultiCiteCommand{\parencites}[\mkbibbrackets]{\parencite}{\multicitedelim}

\DeclareFieldFormat{url}{Disponível em:\addcolon\addspace\url{#1}
}%



\begin{document}

\cite{article}.


\nocite{*}

\printbibliography

\end{document}