%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Cao_etal2007} Cao, A., Jiang, L., Chen, S. H., Antipov, S. V., \& Shi, S. C. (2007). IF gain bandwidth of a quasi-optical NbN superconducting HEB mixer. In \textit{Proc. International conference on microwave and millimeter wave technology} (pp. 1--3). Builin.

\end{thebibliography}

\end{document}

