@article{IIMI_2012_39_1_a17,
     author = {A. K. Demenchuk},
     title = {Frequency spectrum control problem of linear periodic systems},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {44--45},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2012_39_1_a17/}
}