TY  - JOUR
AU  - V. I. Filippenko
TI  - Estimation of the multiplicity of the spectrum of a selfadjoint differential operator
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 2286
EP  - 2287
VL  - 11
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_12_a25/
LA  - ru
ID  - DE_1975_11_12_a25
ER  -