TY - JOUR AU - P. B. Golokvoschyus TI - Periodic solutions of a special nonlinear differential system JO - Differencialʹnye uravneniâ PY - 1984 SP - 1623 EP - 1628 VL - 20 IS - 9 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1984_20_9_a21/ LA - ru ID - DE_1984_20_9_a21 ER -