Effects of size polydispersity on segregation of spherical particles in rotating drum Thanh-Trung Vo, Thi Lo Vu and Patrick Mutabaruka Eur. Phys. J. E, 44 6 (2021) 86 Published online: 27 June 2021 DOI: 10.1140/epje/s10189-021-00091-0