TY - JOUR AU - V. I. Ovchinnikov TI - On a~problem in the theory of nonlinear Fredholm operators JO - Matematičeskie zametki PY - 1971 SP - 541 EP - 549 VL - 10 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1971_10_5_a8/ LA - ru ID - MZM_1971_10_5_a8 ER -