%0 Journal Article
%A V. A. Chernyatin
%T Necessary and sufficient conditions for existence of the classical
%J Doklady Akademii Nauk
%D 1986
%P 1080-1083
%V 287
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1986_287_5_a12/
%G ru
%F DAN_1986_287_5_a12