%0 Journal Article
%A V. A. Baikov
%A R. K. Gazizov
%A N. Kh. Ibragimov
%T Approximate symmetries and preservation laws
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1991
%P 35-45
%V 200
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1991_200_a3/
%G ru
%F TM_1991_200_a3