%0 Journal Article %A V. E. Chernyshev %T Bifurcations of invariant sets in a neighborhood of a contour of trajectories with a rest point which is a saddle %J Differencialʹnye uravneniâ %D 1986 %P 439-445 %V 22 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1986_22_3_a10/ %G ru %F DE_1986_22_3_a10