TY - JOUR AU - M. H. Avetisyan TI - On solvability of a nonlinear discrete system in the spread theory of infection JO - Proceedings of the Yerevan State University. Physical and mathematical sciences PY - 2020 SP - 87 EP - 95 VL - 54 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/UZERU_2020_54_2_a1/ LA - en ID - UZERU_2020_54_2_a1 ER -