%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{vanCleempoel_etal1996} {\textquotedblleft}\textit{Quantitative determination of C$_{60}$ and C$_{70}$ in soot extracts by high performance liquid chromatography and mass spectrometric characterization}{\textquotedblright}. van Cleempoel A, Gijbels R, Zhu D, Claeys M, Richter H, Fonseca A, Fullerene science and technology \textbf{4}, 1001 (1996).   http://doi.org/10.1080/10641229608001158

\end{thebibliography}

\end{document}

