%0 Journal Article
%A V. V. Lychagin
%T Geometric theory of singularities of solutions of nonlinear differential equations
%J Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara
%D 1988
%P 207-247
%V 20
%I mathdoc
%U http://geodesic.mathdoc.fr/item/INTG_1988_20_a4/
%G ru
%F INTG_1988_20_a4