%0 Journal Article
%A A. M. Vinogradov
%A I. S. Krasil'shchik
%T On the theory of nonlocal symmetries of nonlinear partial
%J Doklady Akademii Nauk
%D 1984
%P 1044-1049
%V 275
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1984_275_5_a3/
%G ru
%F DAN_1984_275_5_a3