Geodesic
Uniqueness of the polynomial of best $L$-approximation of discontinuous functions
Matematičeskie zametki, Tome 52 (1992) no. 6, pp. 89-99.

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     author = {N. K. Rakhmetov},
     title = {Uniqueness of the polynomial of best $L$-approximation of discontinuous functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {89--99},
     publisher = {mathdoc},
     volume = {52},
     number = {6},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_52_6_a10/}
}
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N. K. Rakhmetov. Uniqueness of the polynomial of best $L$-approximation of discontinuous functions. Matematičeskie zametki, Tome 52 (1992) no. 6, pp. 89-99. http://geodesic.mathdoc.fr/item/MZM_1992_52_6_a10/