%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Bombacigno_etal2021} Bombacigno, F., Boudet, S., \& Montani, G. (2021). Generalized Ashtekar variables for Palatini f(R) models. \textit{Nucl. Phys. B}, \textit{963}, 115281--21pp.

\end{thebibliography}

\end{document}

