%0 Journal Article
%A E. P. Dolzhenko
%A V. I. Danchenko
%T Dependence of the differentiability of functions of several variables on their rate of approximation by rational functions
%J Izvestiya. Mathematics 
%D 1977
%P 171-192
%V 11
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1977_11_1_a5/
%G en
%F IM2_1977_11_1_a5