Bibliography get print with lines

I am using simple package \bibliographystyle{plain}. However, the bibliography get printed with lines as seen in the image.

My code is below

\cleardoublepage
\pagenumbering{arabic}

\include{theory/intro}
\include{theory/Pre-Processing}
\include{theory/Processing}
\include{theory/post-processing}
\include{theory/LKW-Stone-Trapping}
\include{theory/Results_Comparision}
\include{theory/Hypothesis_Evaluation}
%\include{theory/result_discussion}
\include{theory/Conclusion_and_Outlook_2}
\include{files/Appen_2}
\bibliographystyle{plain}
\bibliography{bibliography}
\end{document}


I did not use any packages above.

How can I remove those lines? What steps should be taken?

• If I should guess: put \normalem before the bib and read the documentation of the ulem package. – Ulrike Fischer May 22 '16 at 21:45
• @UlrikeFischer Do you want to answer? Or close as a duplicate? Or close as unclear? Or ... ? – cfr May 23 '16 at 2:45

You didn't show a minimal example, but I guess that you are using the ulem package which redefines \emph to underline. Use \normalem before the bibliographie to get back the normal \emph and read the documentation of ulem.