Giant Molecular Clouds as probes of of Galactic Cosmic Rays with Fermi-LAT Giada Peron, Felix Aharonian, Sabrina Casanova, Ruizhi Yang and Roberta Zanin EPJ Web Conf., 209 (2019) 01016 Published online: 13 May 2019 DOI: 10.1051/epjconf/201920901016