TY - JOUR AU - Yu. V. Churin TI - Dependence of the periodic solutions of a third order system of differential equations on parameters JO - Differencialʹnye uravneniâ PY - 1969 SP - 1338 EP - 1340 VL - 5 IS - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1969_5_7_a22/ LA - ru ID - DE_1969_5_7_a22 ER -