%0 Journal Article
%A I. I. Golichev
%T Approximation of an element in the range of a function of an operator
%J Doklady Akademii Nauk
%D 1979
%P 527-530
%V 245
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1979_245_3_a2/
%G ru
%F DAN_1979_245_3_a2