%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Trifonov_etal2015} Trifonov A, Tong CE, Lobanov Y, Kaurova N, Blundell R, Gol{\textquoteright}tsman G. An investigation of the DC and IF performance of silicon-membrane HEB mixer elements. In: Proc. 26$^{th}$ Int. Symp. Space Terahertz Technol.; 2015. 40.

\end{thebibliography}

\end{document}

