Extremal elements and the value of the best approximation of a monotone function on $R^n$ by sums of functions of fewer variables
Doklady Akademii Nauk, Tome 265 (1982) no. 1, pp. 11-13.

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     author = {M.-B. A. Babaev},
     title = {Extremal elements and the value of the best approximation of a monotone function on $R^n$ by sums of functions of fewer variables},
     journal = {Doklady Akademii Nauk},
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     publisher = {mathdoc},
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     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_265_1_a0/}
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M.-B. A. Babaev. Extremal elements and the value of the best approximation of a monotone function on $R^n$ by sums of functions of fewer variables. Doklady Akademii Nauk, Tome 265 (1982) no. 1, pp. 11-13. http://geodesic.mathdoc.fr/item/DAN_1982_265_1_a0/