%0 Journal Article %A V. K. Mel'nikov %T On certain cases of conservation of almost periodic motions with a small change of the Hamiltonian function %J Doklady Akademii Nauk %D 1965 %P 1245-1248 %V 165 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1965_165_6_a6/ %G ru %F DAN_1965_165_6_a6