TY - JOUR AU - M. M. Khapaev AU - V. N. Shinkin TI - Extremal properties of the Lyapunov function on unstable resonance regimes in the multifrequency case JO - Differencialʹnye uravneniâ PY - 1986 SP - 1463 EP - 1466 VL - 22 IS - 8 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1986_22_8_a25/ LA - ru ID - DE_1986_22_8_a25 ER -