%0 Journal Article %A I. N. Sergeev %T On the attainability of minimal exponents in the class of infinitesimal perturbations %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2000 %P 61-63 %N 3 %U http://geodesic.mathdoc.fr/item/VMUMM_2000_3_a14/ %G ru %F VMUMM_2000_3_a14