A continuous version of Liapunov's convexity theorem
Annales de l'I.H.P. Analyse non linéaire, Tome 5 (1988) no. 1, pp. 23-36.
@article{AIHPC_1988__5_1_23_0,
     author = {Cellina, Arrigo and Colombo, Giovanni and Fonda, Alessandro},
     title = {A continuous version of {Liapunov's} convexity theorem},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {23--36},
     publisher = {Gauthier-Villars},
     volume = {5},
     number = {1},
     year = {1988},
     mrnumber = {936888},
     zbl = {0647.28002},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1988__5_1_23_0/}
}
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Cellina, Arrigo; Colombo, Giovanni; Fonda, Alessandro. A continuous version of Liapunov's convexity theorem. Annales de l'I.H.P. Analyse non linéaire, Tome 5 (1988) no. 1, pp. 23-36. http://www.numdam.org/item/AIHPC_1988__5_1_23_0/

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[5] A. Liapunov, same as above, Vol. 10, 1946, pp. 277-279 (Russian); for an English version, see J. Diestel and J.J. Uhl, Vector Measures, 1977, A.M.S., Providence,Rhode Island, p. 262.

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