%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{EkstromH._etal1995} Ekstrom H., Karasik B. S., Kollberg E.L., \& Yngvesson K.S. (1995). Conversion Gain and Noise of Niobium Superconducting Hot-Electron-Mixers. \textit{IEEE Trans. Microw. Theory Techn.}, \textit{43}, 938--947.

\end{thebibliography}

\end{document}

