%0 Journal Article %A N. A. Lyul'ko %T On the instability of hyperbolic systems on the plane under small periodic perturbation %J Sibirskij žurnal industrialʹnoj matematiki %D 2010 %P 85-97 %V 13 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SJIM_2010_13_2_a8/ %G ru %F SJIM_2010_13_2_a8