TY - JOUR AU - S. Yu. Pilyugin TI - The phase diagrams of systems of differential equations that satisfy axiom~$A$ JO - Differencialʹnye uravneniâ PY - 1973 SP - 647 EP - 649 VL - 9 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1973_9_4_a7/ LA - ru ID - DE_1973_9_4_a7 ER -