%0 Journal Article
%A A. V. Kolushov
%T On differentiability of the operator of best approximation by rational fractions
%J Doklady Akademii Nauk
%D 1982
%P 1060-1062
%V 264
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1982_264_5_a7/
%G ru
%F DAN_1982_264_5_a7