TY - JOUR AU - L. I. Zhilevich TI - On the existence and location of limit cycles in an autonomous system JO - Differencialʹnye uravneniâ PY - 1985 SP - 1079 EP - 1081 VL - 21 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1985_21_6_a23/ LA - ru ID - DE_1985_21_6_a23 ER -