%0 Journal Article
%A V. S. Shulman
%T On algebras of operators in a space with indefinite metric of type $\Pi_1$
%J Doklady Akademii Nauk
%D 1971
%P 44-47
%V 201
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_201_1_a10/
%G ru
%F DAN_1971_201_1_a10