The study of discrete cavity soliton lasers in presence of population inversion Ahmad Motahharynia, Keivan Mahmoud Aghdami and Reza Kheradmand Eur. Phys. J. Plus, 135 1 (2020) 2 Published online: 07 January 2020 DOI: 10.1140/epjp/s13360-019-00017-y