TY - JOUR AU - M. M. Khapaev TI - Conditions for the controllability of singularly perturbed systems JO - Doklady Akademii Nauk PY - 1991 SP - 300 EP - 302 VL - 320 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a8/ LA - ru ID - DAN_1991_320_2_a8 ER -