Geodesic
Approximation and the maximum principle in nonsmooth optimal control problems
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 4 
B. Sh. Mordukhovich. Approximation and the maximum principle in nonsmooth optimal control problems. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 4. http://geodesic.mathdoc.fr/item/RM_1977_32_4_a13/
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     author = {B. Sh. Mordukhovich},
     title = {Approximation and the maximum principle in nonsmooth optimal control problems},
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     number = {4},
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     url = {http://geodesic.mathdoc.fr/item/RM_1977_32_4_a13/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] B. Sh. Mordukhovich, “Printsip maksimuma v zadache optimalnogo bystrodeistviya s negladkimi ogranicheniyami”, PMM, 40:6 (1976), 1014–1023 | MR | Zbl

[2] L. S. Pontryagin, V. G. Boltyanskii, R. V. Gamkrelidze, E. F. Mischenko, Matematicheskaya teoriya optimalnykh protsessov, Fizmatgiz, M., 1961 | MR

[3] A. D. Ioffe, V. M. Tikhomirov, “Dvoistvennost vypuklykh funktsii i ekstremalnye zadachi”, UMN, 23:6 (1968), 51–116 | MR | Zbl