Geodesic
Widths of classes from $L_2[0,2\pi]$ and the minimization of exact constants in Jackson-type inequalities
Matematičeskie zametki, Tome 65 (1999) no. 6, pp. 816-820 
M. G. Esmaganbetov. Widths of classes from $L_2[0,2\pi]$ and the minimization of exact constants in Jackson-type inequalities. Matematičeskie zametki, Tome 65 (1999) no. 6, pp. 816-820. http://geodesic.mathdoc.fr/item/MZM_1999_65_6_a2/
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