\addcontentsline{toc}{chapter}{References}
\begin{thebibliography}{99}
+ \bibitem{alder1}
+ B. J. Alder, T.E. Wainwright.
+ J. Chem. Phys. 27 (1957) 1208.
+ \bibitem{alder2}
+ B. J. Alder, T.E. Wainwright.
+ J. Chem. Phys. 31 (1959) 459.
\bibitem{example}
\selectlanguage{german}
F. Zirkelbach, M. H"aberlen, J. K. N. Lindner, B. Stritzker.