%0 Journal Article
%A P. E. Sobolevskii
%T On logarithms of normal positive operators
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1961
%V 16
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1961_16_4_a19/
%G ru
%F RM_1961_16_4_a19