Geodesic
Differentiability of the best approximation operator
Matematičeskie zametki, Tome 29 (1981) no. 4, pp. 577-596.

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     author = {A. V. Kolushov},
     title = {Differentiability of the best approximation operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {577--596},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_29_4_a10/}
}
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A. V. Kolushov. Differentiability of the best approximation operator. Matematičeskie zametki, Tome 29 (1981) no. 4, pp. 577-596. http://geodesic.mathdoc.fr/item/MZM_1981_29_4_a10/