Geodesic
The set of all polynomials of best approximation of fixed order for a~class of continuous functions of two variables
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1988), pp. 71-77.

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@article{IVM_1988_5_a10,
     author = {A. P. Khvostov},
     title = {The set of all polynomials of best approximation of fixed order for a~class of continuous functions of two variables},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {71--77},
     publisher = {mathdoc},
     number = {5},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1988_5_a10/}
}
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A. P. Khvostov. The set of all polynomials of best approximation of fixed order for a~class of continuous functions of two variables. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1988), pp. 71-77. http://geodesic.mathdoc.fr/item/IVM_1988_5_a10/