Geodesic
Piecewise polynomial approximation and local approximations
Doklady Akademii Nauk, Tome 201 (1971) no. 1, pp. 16-18 
Yu. A. Brudnyi. Piecewise polynomial approximation and local approximations. Doklady Akademii Nauk, Tome 201 (1971) no. 1, pp. 16-18. http://geodesic.mathdoc.fr/item/DAN_1971_201_1_a2/
@article{DAN_1971_201_1_a2,
     author = {Yu. A. Brudnyi},
     title = {Piecewise polynomial approximation and local approximations},
     journal = {Doklady Akademii Nauk},
     pages = {16--18},
     year = {1971},
     volume = {201},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_201_1_a2/}
}
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