\documentclass{article}
\usepackage[latin1]{inputenc}
\usepackage{fullpage}
\begin{document}
\begin{itemize}
\section*{Communications}

\subsection*{Poster}

\item[1] ``Hydrogen impurity in MgO as seen by the muonium analogue'', Ali Roonkiani, Rui C Vilão, R. B. L. Vieira, Helena V Alberto, João M Gil, R. Scheuermann, A. G. Marinopoulos, 15th International Conference on Muon Spin Rotation, Relaxation and Resonance
Parma, Italy, 29/August-2/September (2022).

\end{itemize}
\end{document}