TY - JOUR AU - A. M. Samoilenko AU - I. V. Polesya TI - Occurrence of invariant sets in the neighborhood of the equilibrium position JO - Differencialʹnye uravneniâ PY - 1975 SP - 1409 EP - 1415 VL - 11 IS - 8 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1975_11_8_a6/ LA - ru ID - DE_1975_11_8_a6 ER -