TY  - JOUR
AU  - L. I. Vainerman
AU  - M. L. Gorbachuk
TI  - On boundary value problems for a second-order differential equation of hyperbolic type in a Hilbert space
JO  - Doklady Akademii Nauk
PY  - 1975
SP  - 763
EP  - 766
VL  - 221
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1975_221_4_a1/
LA  - ru
ID  - DAN_1975_221_4_a1
ER  -