%0 Journal Article
%A L. I. Vainerman
%T Selfadjoint boundary-value problems for strongly elliptic and hyperbolic equations of second order in Hilbert space
%J Doklady Akademii Nauk
%D 1974
%P 745-748
%V 218
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1974_218_4_a0/
%G ru
%F DAN_1974_218_4_a0