%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Potgieter-Vermaak_etal2006} {\textquotedblleft}\textit{Comparison of limestone, dolomite and fly ash as pre-treatment agents for acid mine drainage}{\textquotedblright}. Potgieter-Vermaak SS, Potgieter JH, Monama P, Van Grieken R, Minerals engineering \textbf{19}, 454 (2006).   http://doi.org/10.1016/J.MINENG.2005.07.009

\end{thebibliography}

\end{document}

