%0 Journal Article %A V. V. Aleksandrov %A O. V. Aleksandrova %A I. S. Konovalenko %A K. V. Tikhonova %T Perturbed stable systems on a plane. I %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2016 %P 30-36 %N 5 %U http://geodesic.mathdoc.fr/item/VMUMM_2016_5_a4/ %G ru %F VMUMM_2016_5_a4