%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Schubert+Stein2002} Schubert, M., \& Stein, H. (2002). \textit{Temperaturpr{\"a}ferenz juveniler Sterlets (Acipenser ruthenus)} (Vol. 2002).

\end{thebibliography}

\end{document}

