%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Pentcheva_etal1984} {\textquotedblleft}\textit{Recherches microchimiques comparatives (SME et AAN) d{\textquoteright}hydrothermes des granites de la Bulgarie du Sud}{\textquotedblright}. Pentcheva EN, Swenters K, Van {\textquoteright}t dack L, Verlinden J, Gijbels R, Doklady Bolgarskoi Akademii Nauk \textbf{37}, 509 (1984)

\end{thebibliography}

\end{document}

