%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{5}

\bibitem{Klapwijk+Semenov2017} Klapwijk, T. M., \& Semenov, A. V. (2017). Engineering physics of superconducting hot-electron bolometer mixers. \textit{IEEE Trans. THz Sci. Technol.}, \textit{7}(6), 627--648.

\end{thebibliography}

\end{document}

