TY - JOUR AU - È. S. Shpigelman TI - The radius of attraction of a certain two-dimensional system JO - Differencialʹnye uravneniâ PY - 1974 SP - 563 EP - 566 VL - 10 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1974_10_3_a24/ LA - ru ID - DE_1974_10_3_a24 ER -