%0 Journal Article
%A V. V. Lychagin
%T Differential equations on two-dimensional manifolds
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1992
%P 43-57
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1992_5_a4/
%G ru
%F IVM_1992_5_a4