Geodesic
Existence of positional control for the time optimal control problem
Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, no. 2 (2002), pp. 67-68 
N. V. Milich. Existence of positional control for the time optimal control problem. Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, no. 2 (2002), pp. 67-68. http://geodesic.mathdoc.fr/item/IIMI_2002_2_a17/
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     author = {N. V. Milich},
     title = {Existence of positional control for the time optimal control problem},
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     pages = {67--68},
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     url = {http://geodesic.mathdoc.fr/item/IIMI_2002_2_a17/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Non-stationary control system is considered. The conditions are given under which time-optimal positional control constructed for linear system is positional control for a certain family of nonlinear systems.

[1] Milich N. V., “Pozitsionnoe upravlenie vozmuschennoi sistemoi, blizkoi k dokriticheskoi”, Izvestiya Instituta matematiki i informatiki UdGU, 2000, no. 2(19), 38–53