%0 Journal Article
%A M. Yu. Zvyagin
%T Classification of B\"acklund transformations of second-order partial differential equations
%J Matematičeskie zametki
%D 1981
%P 829-842
%V 29
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1981_29_6_a3/
%G ru
%F MZM_1981_29_6_a3