%0 Journal Article
%A P. E. Sobolevskii
%T On $S$-numbers of positive operators
%J Doklady Akademii Nauk
%D 1970
%P 1245-1247
%V 193
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_193_6_a8/
%G ru
%F DAN_1970_193_6_a8