%0 Journal Article
%A A. M. Vinogradov
%A I. S. Krasil'shchik
%T A method of computing higher symmetries of nonlinear evolution equations, and nonlocal symmetries
%J Doklady Akademii Nauk
%D 1980
%P 1289-1293
%V 253
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1980_253_6_a0/
%G ru
%F DAN_1980_253_6_a0