Geodesic
Classes characterized by best-possible approximation by spline functions
Matematičeskie zametki, Tome 8 (1970) no. 2, pp. 137-148.

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Certain classes of functions are introduced which are characterized by their best-possible approximation by splines. 
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     author = {V. A. Popov and Bl. Kh. Sendov},
     title = {Classes characterized by best-possible approximation by spline functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {137--148},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_2_a1/}
}
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V. A. Popov; Bl. Kh. Sendov. Classes characterized by best-possible approximation by spline functions. Matematičeskie zametki, Tome 8 (1970) no. 2, pp. 137-148. http://geodesic.mathdoc.fr/item/MZM_1970_8_2_a1/