Geodesic
The approximation of polynomials of two variables by functions of the form $\varphi(x)+\psi(y)$
Doklady Akademii Nauk, Tome 193 (1970) no. 5, pp. 967-969 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {M.-B. A. Babaev},
     title = {The approximation of polynomials of two variables by functions of the form $\varphi(x)+\psi(y)$},
     journal = {Doklady Akademii Nauk},
     pages = {967--969},
     year = {1970},
     volume = {193},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_5_a0/}
}
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M.-B. A. Babaev. The approximation of polynomials of two variables by functions of the form $\varphi(x)+\psi(y)$. Doklady Akademii Nauk, Tome 193 (1970) no. 5, pp. 967-969. http://geodesic.mathdoc.fr/item/DAN_1970_193_5_a0/