%0 Journal Article %A A. K. Demenchuk %T Frequency spectrum control problem of linear periodic systems %J Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta %D 2012 %P 44-45 %N 1 %U http://geodesic.mathdoc.fr/item/IIMI_2012_1_a17/ %G ru %F IIMI_2012_1_a17