TY  - JOUR
AU  - G. M. Gubreev
AU  - A. I. Kovalenko
TI  - Tests for completeness of root subspaces of a differentiation operator with abstract boundary conditions
JO  - Matematičeskie zametki
PY  - 1981
SP  - 543
EP  - 552
VL  - 30
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1981_30_4_a7/
LA  - ru
ID  - MZM_1981_30_4_a7
ER  -