Geodesic
The minimum number of vector fields forming a control system with given properties
Differencialʹnye uravneniâ, Tome 21 (1985) no. 12, pp. 2063-2068.

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     author = {N. N. Petrov},
     title = {The minimum number of vector fields forming a control system with given properties},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2063--2068},
     publisher = {mathdoc},
     volume = {21},
     number = {12},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_12_a5/}
}
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N. N. Petrov. The minimum number of vector fields forming a control system with given properties. Differencialʹnye uravneniâ, Tome 21 (1985) no. 12, pp. 2063-2068. http://geodesic.mathdoc.fr/item/DE_1985_21_12_a5/