%0 Journal Article
%A S. G. Krein
%A P. E. Sobolevskii
%T Differential equation with abstract elliptical operator in Hilbert space
%J Doklady Akademii Nauk
%D 1958
%P 233-236
%V 118
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_118_2_a6/
%G ru
%F DAN_1958_118_2_a6