Some problems in accessibility theory
Analyse des systèmes, Astérisque, no. 75-76 (1980), pp. 167-176. 
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     number = {75-76},
     year = {1980},
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     zbl = {0458.93004},
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     url = {http://archive.numdam.org/item/AST_1980__75-76__167_0/}
}
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Kupka, Ivan. Some problems in accessibility theory, dans Analyse des systèmes, Astérisque, no. 75-76 (1980), pp. 167-176. http://archive.numdam.org/item/AST_1980__75-76__167_0/

[1] Jurdjevic - Sussman. - Controllability of non linear systems. Journ. of Diff. Equations, vol.12, n°1 (1972), p. 95-116. | DOI | MR

[2] C. Lobry. - Controllability of non linear systems on compact manifolds. SIAM Journ. of Control, vol.12, n°1 (1974), p.1-4. | DOI | MR | Zbl