%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{2031} German Ros, Jesus Martinez del Rincon and Gines Garcia-Mateos. 2012. Articulated Particle Filter for Hand Tracking. \textit{21st International Conference on Pattern Recognition}.3581--3585.

\end{thebibliography}

\end{document}

