This bibliographic entry surely merits using "native" accented characters instead of the cumbersome alternative. Compile with either natbib/BibTeX or biblatex/biber.
If, however, you can't employ
author = "Jan Babecký and Tomáš Havránek and Jakub Matějů
and Marek Rusnák and Kateřina Šmídková
and Bořek Vašíček",
you should set the author field as follows:
author = "Jan Babeck{\'y} and Tom{\'a}{\v s} Havr{\'a}nek and Jakub Mat{\v e}j{\r u}
and Marek Rusn{\'a}k and Kate{\v r}ina {\v S}m{\'i}dkov{\'a}
and Bo{\v r}ek Va{\v s}{\'i}{\v c}ek",
See How to write “ä” and other umlauts and accented letters in bibliography for more information on how to enter 'accented' characters in a bib file. Shameless self-citation alert! :-)

\documentclass{article}
\begin{filecontents}[overwrite]{mybib.bib}
%% Source: https://www.sciencedirect.com/science/article/pii/S1572308914000606
@article{babecky-etal:2014,
author = "Jan Babecký and Tomáš Havránek and Jakub Matějů and Marek Rusnák
and Kateřina Šmídková and Bořek Vašíček",
title = "Banking, debt, and currency crises in developed countries: Stylized
facts and early warning indicators",
journal= "Journal of Financial Stability",
volume = "15",
pages = "1--17",
year = "2014",
issn = "1572-3089",
doi = "https://doi.org/10.1016/j.jfs.2014.07.001",
url = "http://www.sciencedirect.com/science/article/pii/S1572308914000606",
}
\end{filecontents}
\usepackage[T1]{fontenc}
\usepackage{lmodern} % use a font family with required "accented" characters
\usepackage{xurl}
\usepackage[round]{natbib}
\bibliographystyle{plainnat} % or some other suitable bib style
\begin{document}
\citet{babecky-etal:2014}
\bibliography{mybib}
\end{document}
\uudefined? – daleif Jan 16 '20 at 14:42