%0 Journal Article
%A A. V. Kolushov
%T Differential properties of the operator of best approximation by rational fractions
%J Matematičeskie zametki
%D 1989
%P 40-50
%V 45
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1989_45_2_a4/
%G ru
%F MZM_1989_45_2_a4