Geodesic
On the Best Approximation of Riemann Integrable Functions by Trigonometric Polynomials
Mathematica balkanica, Tome 4 (1990) no. 3-4, p. 289.

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     author = {H. Mevissen and R. J. Nessel},
     title = {On the {Best} {Approximation} of {Riemann} {Integrable} {Functions} by {Trigonometric} {Polynomials}},
     journal = {Mathematica balkanica},
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     publisher = {mathdoc},
     volume = {4},
     number = {3-4},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/MABA_1990_4_3-4_a6/}
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H. Mevissen; R. J. Nessel. On the Best Approximation of Riemann Integrable Functions by Trigonometric Polynomials. Mathematica balkanica, Tome 4 (1990) no. 3-4, p. 289. http://geodesic.mathdoc.fr/item/MABA_1990_4_3-4_a6/