TY  - JOUR
AU  - A. G. Baskakov
TI  - A~theorem on splitting an operator, and some related questions in the analytic theory of perturbations
JO  - Izvestiya. Mathematics 
PY  - 1987
SP  - 421
EP  - 444
VL  - 28
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1987_28_3_a0/
LA  - en
ID  - IM2_1987_28_3_a0
ER  -