%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{vanGrieken_etal1968} {\textquotedblleft}\textit{The determination of silicon in steel by 14-mev neutron activation analysis}{\textquotedblright}. van Grieken R, Gijbels R, Speecke A, Hoste J, Analytica chimica acta \textbf{43}, 199 (1968).   http://doi.org/10.1016/S0003-2670(00)89208-9

\end{thebibliography}

\end{document}

