Cloud-cloud collision as origin of the G31.41+0.31 massive protocluster M. T. Beltrán, V. M. Rivilla, M. S. N. Kumar, R. Cesaroni and D. Galli A&A, 660 (2022) L4 Published online: 05 April 2022 DOI: 10.1051/0004-6361/202243361