TY  - JOUR
AU  - P. V. Popov
TI  - Variational principles for the spectrum of nonselfadjoint operators
JO  - Doklady Akademii Nauk
PY  - 1973
SP  - 1290
EP  - 1292
VL  - 208
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1973_208_6_a7/
LA  - ru
ID  - DAN_1973_208_6_a7
ER  -