%0 Journal Article %A T. V. Salova %T The efficiency of perturbations in the class of linear Hamiltonian systems %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2015 %P 48-52 %N 6 %U http://geodesic.mathdoc.fr/item/VMUMM_2015_6_a8/ %G ru %F VMUMM_2015_6_a8