Novel fully-heterogeneous GNN designs for track reconstruction at the HL-LHC Sylvain Caillou, Christophe Collard, Charline Rougier, Jan Stark, Heberth Torres and Alexis Vallier EPJ Web of Conf., 295 (2024) 09028 Published online: 06 May 2024 DOI: 10.1051/epjconf/202429509028