Comparison of variance reduction methods in shielding problems with source multiplication Matteo Falabino, Daniele Sciannandrone, Davide Mancusi, Emiliano Masiello, Odile Petit, Andrea Zoia and Laurent Chabert Eur. Phys. J. Plus, 136 5 (2021) 598 Published online: 29 May 2021 DOI: 10.1140/epjp/s13360-021-01594-7