Geodesic
Minimal possible number of controls in a linear time-invariant control system
Differencialʹnye uravneniâ, Tome 17 (1981) no. 4, pp. 589-597 
V. Y. Belozerov; G. V. Mozhaev. Minimal possible number of controls in a linear time-invariant control system. Differencialʹnye uravneniâ, Tome 17 (1981) no. 4, pp. 589-597. http://geodesic.mathdoc.fr/item/DE_1981_17_4_a1/
@article{DE_1981_17_4_a1,
     author = {V. Y. Belozerov and G. V. Mozhaev},
     title = {Minimal possible number of controls in a linear time-invariant control system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {589--597},
     year = {1981},
     volume = {17},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_4_a1/}
}
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