TY - JOUR AU - V. E. Chernyshev TI - Bifurcations of invariant sets in a neighborhood of a contour of trajectories with a rest point which is a saddle JO - Differencialʹnye uravneniâ PY - 1986 SP - 439 EP - 445 VL - 22 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1986_22_3_a10/ LA - ru ID - DE_1986_22_3_a10 ER -