%0 Journal Article
%A V. È. Lyantse
%T Conditions for closedness of the contraction of a self-adjoint operator
%J Doklady Akademii Nauk
%D 1960
%P 1023-1026
%V 132
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1960_132_5_a13/
%G ru
%F DAN_1960_132_5_a13