Multi-particle reconstruction in the High Granularity Calorimeter using object condensation and graph neural networksShah Rukh Qasim, Kenneth Long, Jan Kieseler, Maurizio Pierini, for the CMS Collaboration and Raheel NawazEPJ Web Conf., 251 (2021) 03072DOI: https://doi.org/10.1051/epjconf/202125103072