%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{deVyt_etal1999} {\textquotedblleft}\textit{Characterization of Ag$_{x}$Au$_{y}$ nano particles by TEM and STEM}{\textquotedblright}. de Vyt A, Gijbels R, Davock H, van Roost C, Geuens I, Journal of analytical atomic spectrometry \textbf{14}, 499 (1999).   http://doi.org/10.1039/a807695b

\end{thebibliography}

\end{document}

