%0 Journal Article
%A L. I. Vainerman
%A M. L. Gorbachuk
%T On boundary value problems for a second-order differential equation of hyperbolic type in a Hilbert space
%J Doklady Akademii Nauk
%D 1975
%P 763-766
%V 221
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1975_221_4_a1/
%G ru
%F DAN_1975_221_4_a1