TY  - JOUR
AU  - I. I. Ibragimov
AU  - I. F. Kushnirchuk
TI  - On the completeness of the system of eigenfunctions of a class of partial differential operators
JO  - Doklady Akademii Nauk
PY  - 1975
SP  - 1020
EP  - 1023
VL  - 222
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1975_222_5_a1/
LA  - ru
ID  - DAN_1975_222_5_a1
ER  -