%&LaTeX
\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{10}

\bibitem{Auer1998} Auer, R. (1998). \textit{Steinkrebspopulationen {\"u}berleben durch anthropogene Isolation} (Vol. 137).

\end{thebibliography}

\end{document}

