%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{10}

\bibitem{Reig_etal2019} Reig, M., Restrepo, D., Valle, J. W. F., \& Zapata, O. (2019). Bound-state dark matter with Majorana neutrinos. \textit{Phys. Lett. B}, \textit{790}, 303--307.

\end{thebibliography}

\end{document}

