%0 Journal Article
%A E. I. Pustyl'nik
%T Certain properties of concave functions of a selfadjoint operator
%J Doklady Akademii Nauk
%D 1969
%P 1259-1261
%V 186
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_186_6_a6/
%G ru
%F DAN_1969_186_6_a6