%0 Journal Article
%A V. I. Ryazanov
%T Necessary and sufficient conditions for differentiability in the sense of Belinskii
%J Doklady Akademii Nauk
%D 1992
%P 241-244
%V 323
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a10/
%G ru
%F DAN_1992_323_2_a10