A biased MC for muon production for beam-dump experiments Stefan Ghinescu, Babette Döbrich, Elisa Minucci and Tommaso Spadaro Eur. Phys. J. C, 81 8 (2021) 767 Published online: 24 August 2021 DOI: 10.1140/epjc/s10052-021-09541-7