%0 Journal Article
%A M. V. Dragnev
%A V. V. Ryzhkov
%T On the geometry of the characteristic cones of a mapping of $P_m$ into $P_n$ when $m>n$
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1974
%P 81-86
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1974_5_a9/
%G ru
%F IVM_1974_5_a9