%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{33} A. Pujol, X. Varona, \& Joan Serrat. (1997). \textit{A machine vision system for the inspection of industrial sieves.}.

\end{thebibliography}

\end{document}

