TY - JOUR AU - N. N. Butenina AU - N. S. Starodubrovskaya TI - A stable fixed focus and its immunity zone in a second-order controlled dynamical system JO - Differencialʹnye uravneniâ PY - 2004 SP - 1468 EP - 1478 VL - 40 IS - 11 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_2004_40_11_a3/ LA - ru ID - DE_2004_40_11_a3 ER -