TY  - JOUR
AU  - G. V. Radzievskii
TI  - Multiple completeness of root vectors of a~Keldysh pencil perturbed by an operator-valued function analytic in a~disc
JO  - Sbornik. Mathematics
PY  - 1973
SP  - 323
EP  - 347
VL  - 20
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1973_20_3_a1/
LA  - en
ID  - SM_1973_20_3_a1
ER  -