%0 Journal Article %A V. Kozlov %A J. Taskinen %T Floquet problem and center manifold reduction for ordinary differential operators with periodic coefficients in Hilbert spaces %J Algebra i analiz %D 2020 %P 191-218 %V 32 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_2020_32_3_a8/ %G en %F AA_2020_32_3_a8