%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Callaert_etal2019} {\textquotedblleft}\textit{Interstitial defects in the van der Waals gap of Bi$_{2}$Se$_{3}$}{\textquotedblright}. Callaert C, Bercx M, Lamoen D, Hadermann J, Acta Crystallographica. Section B: Structural Science, Crystal Engineering and Materials (Online) \textbf{75}, 717 (2019).   http://doi.org/10.1107/S2052520619008357

\end{thebibliography}

\end{document}

