%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{VanGrieken_etal1975} {\textquotedblleft}\textit{Micro-determination of zirconium-hafnium ratios in zircons by proton induced X-ray emission}{\textquotedblright}. Van Grieken RE, Johansson TB, Winchester JW, Odom L, Fresenius{\textquoteright} Zeitschrift f{\"u}r analytische Chemie \textbf{275}, 343 (1975).   http://doi.org/10.1007/BF00437765

\end{thebibliography}

\end{document}

