%0 Journal Article
%A N. Kh. Ibragimov
%T On the theory of Lie–Bäcklund transformation groups
%J Sbornik. Mathematics
%D 1980
%P 205-226
%V 37
%N 2
%U http://geodesic.mathdoc.fr/item/SM_1980_37_2_a3/
%G en
%F SM_1980_37_2_a3