TY - JOUR AU - V. I. Fomin TI - The method of small regular perturbations in the investigation of singular differential equations in a Banach space JO - Differencialʹnye uravneniâ PY - 1999 SP - 1712 VL - 35 IS - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1999_35_12_a15/ LA - ru ID - DE_1999_35_12_a15 ER -