%0 Journal Article
%A M. G. Krein
%A Yu. L. Shmul'yan
%T A class of operators in a space with an indefinite metric
%J Doklady Akademii Nauk
%D 1966
%P 34-37
%V 170
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1966_170_1_a7/
%G ru
%F DAN_1966_170_1_a7