A problem of Pontryagin
Differencialʹnye uravneniâ, Tome 25 (1989) no. 11, pp. 1888-1891.

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     title = {A problem of {Pontryagin}},
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A. Yu. Kolesov; E. F. Mishchenko. A problem of Pontryagin. Differencialʹnye uravneniâ, Tome 25 (1989) no. 11, pp. 1888-1891. http://geodesic.mathdoc.fr/item/DE_1989_25_11_a8/