TY  - JOUR
AU  - G. I. Laptev
TI  - Boundary value problems for second order differential equations in Hilbert space with a variable selfadjoint operator
JO  - Doklady Akademii Nauk
PY  - 1968
SP  - 283
EP  - 286
VL  - 179
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1968_179_2_a8/
LA  - ru
ID  - DAN_1968_179_2_a8
ER  -