Geodesic
A generalized approximation theorem and an exact representation of polynomials of several variables by superpositions of polynomials of one variable
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1998), pp. 6-9 
A. N. Gorban'. A generalized approximation theorem and an exact representation of polynomials of several variables by superpositions of polynomials of one variable. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1998), pp. 6-9. http://geodesic.mathdoc.fr/item/IVM_1998_5_a1/
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