TY  - JOUR
AU  - G. I. Laptev
TI  - Eigenvalue problems for differential equations of the second order in Banach and Hilbert spaces
JO  - Differencialʹnye uravneniâ
PY  - 1966
SP  - 1151
EP  - 1160
VL  - 2
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1966_2_9_a1/
LA  - ru
ID  - DE_1966_2_9_a1
ER  -