Geodesic
Optimal interpolation and the Lagrange principle
Vladikavkazskij matematičeskij žurnal, Tome 6 (2004) no. 4, pp. 42-47 
G. G. Magaril-Il'yaev. Optimal interpolation and the Lagrange principle. Vladikavkazskij matematičeskij žurnal, Tome 6 (2004) no. 4, pp. 42-47. http://geodesic.mathdoc.fr/item/VMJ_2004_6_4_a6/
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     title = {Optimal interpolation and the {Lagrange} principle},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Alekseev V. M., Tikhomirov V. M., Fomin S. V., Optimalnoe upravlenie, Nauka, M., 1979, 429 pp. | MR

[2] Magaril-Ilyaev G. G., Tikhomirov V. M., Vypuklyi analiz i ego prilozheniya, Editorial URSS, M., 2003, 176 pp.