TY - JOUR AU - V. G. Zadorozhniy TI - A linear first-order differential equation with ordinary and variational derivatives JO - Matematičeskie zametki PY - 1993 SP - 36 EP - 44 VL - 53 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1993_53_4_a4/ LA - ru ID - MZM_1993_53_4_a4 ER -