%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Panin_etal2006} {\textquotedblleft}\textit{Crystal structure and properties of the Na$_{1-x}$Ru$_{2}$O$_{4}$ phase}{\textquotedblright}. Panin RV, Khasanova NR, Abakumov AM, Schnelle W, Hadermann J, Antipov EV, Russian chemical bulletin \textbf{55}, 1717 (2006).   http://doi.org/10.1007/s11172-006-0478-6

\end{thebibliography}

\end{document}

