TY - JOUR AU - N. A. Lyul'ko TI - On the instability of hyperbolic systems on the plane under small periodic perturbation JO - Sibirskij žurnal industrialʹnoj matematiki PY - 2010 SP - 85 EP - 97 VL - 13 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SJIM_2010_13_2_a8/ LA - ru ID - SJIM_2010_13_2_a8 ER -