TY  - JOUR
AU  - V. S. Il'kiv
TI  - Perturbations of a nonlocal problem for differential equations with pseudodifferential coefficients
JO  - Differencialʹnye uravneniâ
PY  - 1990
SP  - 1962
EP  - 1971
VL  - 26
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1990_26_11_a16/
LA  - ru
ID  - DE_1990_26_11_a16
ER  -