TY  - JOUR
AU  - Kh. A. Abduvaitov
AU  - È. M. Muhamadiev
TI  - Invertibility conditions for a second order differential operator
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 2115
EP  - 2123
VL  - 13
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_12_a0/
LA  - ru
ID  - DE_1977_13_12_a0
ER  -