%0 Journal Article
%A P. N. Knyazev
%T A~necessary and sufficient condition for the comparability of operators
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1963
%V 18
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1963_18_4_a9/
%G ru
%F RM_1963_18_4_a9