On the approximation of even and odd bounded $2\pi$-periodic functions by trigonometric polynomials of best uniform approximation at a~given system of points
Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 238-239.

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     author = {N. Ya. Yatsenko},
     title = {On the approximation of even and odd bounded $2\pi$-periodic functions by trigonometric polynomials of best uniform approximation at a~given system of points},
     journal = {Informatics and Automation},
     pages = {238--239},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a147/}
}
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N. Ya. Yatsenko. On the approximation of even and odd bounded $2\pi$-periodic functions by trigonometric polynomials of best uniform approximation at a~given system of points. Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 238-239. http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a147/