%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Dantas_etal2006} {\textquotedblleft}\textit{Precise gamma ray measurement of the radial distribution of a cracking catalyst at diluted concentrations in a glass riser}{\textquotedblright}. Dantas CC, Dos Santos VA, Melo ACBA, Van Grieken R, Nuclear instruments and methods in physics research: B: beam interactions with materials and atoms \textbf{251}, 201 (2006).   http://doi.org/10.1016/J.NIMB.2006.05.009

\end{thebibliography}

\end{document}

