TY - JOUR AU - A. P. Sadovskii TI - Limit cycles of a cubic system of nonlinear oscillations JO - Differencialʹnye uravneniâ PY - 1993 SP - 226 EP - 231 VL - 29 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1993_29_2_a4/ LA - ru ID - DE_1993_29_2_a4 ER -