Geodesic
Differentiability of an operator of best uniform approximation of
Doklady Akademii Nauk, Tome 313 (1990) no. 3, pp. 548-551 
V. V. Kovtunets. Differentiability of an operator of best uniform approximation of. Doklady Akademii Nauk, Tome 313 (1990) no. 3, pp. 548-551. http://geodesic.mathdoc.fr/item/DAN_1990_313_3_a7/
@article{DAN_1990_313_3_a7,
     author = {V. V. Kovtunets},
     title = {Differentiability of an operator of best uniform approximation of},
     journal = {Doklady Akademii Nauk},
     pages = {548--551},
     year = {1990},
     volume = {313},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_313_3_a7/}
}
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