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I have done this, but the webpages don't appear. 

\begin{thebibliography}{99}\\

\bibitem{work1}...\\
\bibitem{work9}J O'Connor i E F Robertson: Squaring the circle [en línia] <\underline{http:www-gap.dcs.st-and.ac.uk/~history/HistTopics/Squaring_the_circle.html}>.\\

\end{thebibliography}
samcarter_is_at_topanswers.xyz
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Guillemus Callelus
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    Load package url or hyperref and use the command \url{http:www-gap.dcs.st-and.ac.uk/~history/HistTopics/Squaring_the_circle.html} or (probably in other contexts) \href{http:www-gap.dcs.st-and.ac.uk/~history/HistTopics/Squaring_the_circle.html}{click on this link!}. Most important: do not do <\underline{http:www-gap.dcs.st-and.ac.uk/~history/HistTopics/Squaring_the_circle.html}>! I also wonder what all those \ are meant to be doing in your .tex file. – jon Oct 21 '16 at 19:07
  • Note that each \bibitem should be separated from the next one by a blank line. Remove the \\ you have. – egreg Oct 21 '16 at 20:26

1 Answers1

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how about the hyperref package? i.e. 

\usepackage{hyperref}

and then in your example

\bibitem{work1}...\ 
\bibitem{work9} J O'Connor i E F Robertson: 
Squaring the circle [en línia] 
\href{http:www-gap.dcs.st-and.ac.uk/~history/HistTopics/Squaring_the_circle.html}\

for more details, have a look at e.g.

How can I have colored and underlined links with hyperref?

https://en.wikibooks.org/wiki/LaTeX/Hyperlinks#.5Chyperref

Community
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Eva
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    The macro \href takes two mandatory arguments. Did you mean to write \url{...}? – Mico Oct 21 '16 at 19:59
  • correct, thank you. which option to chose depends on what exactly the point of the question was ... not so clear to me – Eva Oct 21 '16 at 20:19