TY - JOUR AU - P. E. Sobolevskii TI - A certain type of differential equations in a Banach space JO - Differencialʹnye uravneniâ PY - 1968 SP - 2278 EP - 2280 VL - 4 IS - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1968_4_12_a12/ LA - ru ID - DE_1968_4_12_a12 ER -