TY - JOUR AU - O. M. Kiselev TI - Oscillations near a separatrix in the Duffing equation JO - Trudy Instituta matematiki i mehaniki PY - 2012 SP - 141 EP - 153 VL - 18 IS - 2 UR - http://geodesic.mathdoc.fr/item/TIMM_2012_18_2_a12/ LA - ru ID - TIMM_2012_18_2_a12 ER -