%0 Journal Article
%A U. D. Bekbaev
%T Equivalence and invariants of second-order linear partial differential equations in two variables under a~change of variables
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1999
%P 3-10
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1999_11_a0/
%G ru
%F IVM_1999_11_a0