%0 Journal Article
%A I. D. Cherkasov
%T Tensor conditions for reducibility of elliptic and hyperbolic equations
%J Doklady Akademii Nauk
%D 1972
%P 43-45
%V 203
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1972_203_1_a10/
%G ru
%F DAN_1972_203_1_a10