%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Smits_etal2012} {\textquotedblleft}\textit{Effect of operating and sampling conditions on the exhaust gas composition of small-scale power generators}{\textquotedblright}. Smits M, Vanpachtenbeke F, Horemans B, De Wael K, Hauchecorne B, Van Langenhove H, Demeestere K, Lenaerts S, PLoS ONE \textbf{7}, e32825 (2012).   http://doi.org/10.1371/JOURNAL.PONE.0032825

\end{thebibliography}

\end{document}

