Geodesic
The approximation of functions of two variables by algebraic polynomials that are best on a~given system of points
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1973), pp. 119-125.

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     author = {N. Ya. Yatsenko},
     title = {The approximation of functions of two variables by algebraic polynomials that are best on a~given system of points},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {119--125},
     publisher = {mathdoc},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1973_3_a16/}
}
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N. Ya. Yatsenko. The approximation of functions of two variables by algebraic polynomials that are best on a~given system of points. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1973), pp. 119-125. http://geodesic.mathdoc.fr/item/IVM_1973_3_a16/