Geodesic
Controllability of a linear nonstationary system
Differencialʹnye uravneniâ, Tome 11 (1975) no. 7, pp. 1206-1216 
S. Yu. Kultyshev; E. L. Tonkov. Controllability of a linear nonstationary system. Differencialʹnye uravneniâ, Tome 11 (1975) no. 7, pp. 1206-1216. http://geodesic.mathdoc.fr/item/DE_1975_11_7_a6/
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     author = {S. Yu. Kultyshev and E. L. Tonkov},
     title = {Controllability of a linear nonstationary system},
     journal = {Differencialʹnye uravneni\^a},
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     year = {1975},
     volume = {11},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_7_a6/}
}
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