I get a warning while citing an article in my bibliography:
Warning : Underfull \hbox (badness 6510) in paragraph at lines 618--619
in my latex file.
\documentclass[a4paper,12pt]{report}
\begin{document}
\begin{thebibliography}{00}
\bibitem{backpropagation}
Rumelhart, D., Hinton, G. \& Williams, R. Learning representations by back-propagating errors. Nature 323,533–536 (1986). https://doi.org/10.1038/323533a0
\end{thebibliography}
\end{document}
How do I solve this?
The problem is that your doi does not break lines. To avoid this, you could use the xurl package:
\documentclass[a4paper,12pt]{report}
\usepackage{xurl}
\begin{document}
\begin{thebibliography}{00}
\bibitem{backpropagation}
Rumelhart, D., Hinton, G. \& Williams, R. Learning representations by back-propagating errors. Nature 323,533–536 (1986). \url{https://doi.org/10.1038/323533a0}
\end{thebibliography}
\end{document}
If this line break in the middle of the link is too aggressive, you could also try the url or hyperref package:
\documentclass[a4paper,12pt]{report}
\usepackage{url}
\begin{document}
\begin{thebibliography}{00}
\bibitem{backpropagation}
Rumelhart, D., Hinton, G. \& Williams, R. Learning representations by back-propagating errors. Nature 323,533–536 (1986). \url{https://doi.org/10.1038/323533a0}
\end{thebibliography}
\end{document}
