%0 Journal Article
%A U. D. Bekbaev
%T On the equivalence and differential rational invariants of second-order linear partial differential equations of two variables under a change of variables
%J Differencialʹnye uravneniâ
%D 1998
%P 835-837
%V 34
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1998_34_6_a16/
%G ru
%F DE_1998_34_6_a16