%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Pan_etal2004} Pan SK, A. R. Kerr MWP, Lauria EF, Crady WK, Horner N, Srikanth JS, et al. A fixed-tuned integrated SIS mixer with ultra-wideband IF and quantum-limited sensitivity for ALMA band 3 (84-116 GHz) receivers. In: Proc. 15$^{th}$ Int. Symp. Space Terahertz Technol. ; 2004. p. 55--61.

\end{thebibliography}

\end{document}

