@article{DE_1984_20_3_a0,
     author = {Yu. Sh. Abramov},
     title = {Variational approach to the problem of the control of the spectrum of conservative dynamical systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {371--375},
     year = {1984},
     volume = {20},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_3_a0/}
}