%0 Journal Article %A A. Yu. Kolesov %T Duck trajectories of relaxation systems connected with violation of the normal switching conditions %J Sbornik. Mathematics %D 1991 %P 291-301 %V 68 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1991_68_1_a14/ %G en %F SM_1991_68_1_a14