%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Semenov_etal2002} Semenov A, H{\"u}bers H-W, Richter H, Birk M, Krocka M, Mair U, et al. Performance of terahertz heterodyne receiver with a superconducting hot-electron mixer. In: Proc. 13$^{th}$ Int. Symp. Space Terahertz Technol.; 2002. p. 229--34.

\end{thebibliography}

\end{document}

