TY  - JOUR
AU  - L. I. Vainerman
TI  - Selfadjoint boundary-value problems for strongly elliptic and hyperbolic equations of second order in Hilbert space
JO  - Doklady Akademii Nauk
PY  - 1974
SP  - 745
EP  - 748
VL  - 218
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1974_218_4_a0/
LA  - ru
ID  - DAN_1974_218_4_a0
ER  -