%0 Journal Article
%A S. B. Vakarchuk
%A A. V. Shvachko
%T Inequalities of Kolmogorov's type for derived functions in two variables and application to approximation by an ``angle''
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 2015
%P 3-22
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_2015_11_a0/
%G ru
%F IVM_2015_11_a0