%&LaTeX
\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{1}

\bibitem{Coste_etal2008} Coste, J. - M., Kummer, J. - A., Kraemer, M., \& Porchet, P. - A. (2008). Quelle {\'e}volution pour un patient substitu{\'e} {\`a} la m{\'e}thadone au long cours? \textit{Revue m{\'e}dicale suisse}, \textit{4}(15.10.2008), 2225--2228.

\end{thebibliography}

\end{document}

