%0 Journal Article
%A V. I. Gorbachuk
%A M. L. Gorbachuk
%T Operator approach to approximation problems
%J Algebra i analiz
%D 1997
%P 90-108
%V 9
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AA_1997_9_6_a3/
%G ru
%F AA_1997_9_6_a3