TY - JOUR AU - R. I. Putilova TI - A qualitative study of a certain system of three differential equations by means of integral surfaces JO - Differencialʹnye uravneniâ PY - 1974 SP - 1533 EP - 1536 VL - 10 IS - 8 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1974_10_8_a23/ LA - ru ID - DE_1974_10_8_a23 ER -