%0 Journal Article
%A E. I. Pustyl'nik
%T Absolutely concave functions of positive operators
%J Doklady Akademii Nauk
%D 1976
%P 547-550
%V 228
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1976_228_3_a7/
%G ru
%F DAN_1976_228_3_a7