%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Pereira_etal2010} {\textquotedblleft}\textit{Klein tunneling in single and multiple barriers in graphene}{\textquotedblright}. Pereira JM, Peeters FM, Chaves A, Farias GA, Semiconductor science and technology \textbf{25}, 033002 (2010).   http://doi.org/10.1088/0268-1242/25/3/033002

\end{thebibliography}

\end{document}

