%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Lok_etal1996} {\textquotedblleft}\textit{D$^{-}$ centers probed by resonant tunneling spectroscopy}{\textquotedblright}. Lok JGS, Geim AK, Maan JC, Marmorkos I, Peeters FM, Mori N, Eaves L, Forster TJ, Main PC, Sakai JW, Henini M, Physical review : B : condensed matter and materials physics \textbf{53}, 9554 (1996)

\end{thebibliography}

\end{document}

