Geodesic
Construction of the extremal function for a~functional on the class $H_\omega^{(n)}$
Matematičeskie zametki, Tome 61 (1997) no. 4, pp. 519-529.

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For a functional on the class $H_\omega^{(n)}$, $n\ge3$, we construct the extremal function on which the upper bound obtained by A. I. Stepanets is attained. 
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D. V. Gorbachev. Construction of the extremal function for a~functional on the class $H_\omega^{(n)}$. Matematičeskie zametki, Tome 61 (1997) no. 4, pp. 519-529. http://geodesic.mathdoc.fr/item/MZM_1997_61_4_a3/

[1] Stepanets A. I., Ravnomernye priblizheniya trigonometricheskimi polinomami, Naukova dumka, Kiev, 1981

[2] Korneichuk N. P., Ekstremalnye zadachi teorii priblizhenii, Nauka, M., 1976

[3] Stepanets A. I., “Ob odnoi ekstremalnoi zadache v prostranstve nepreryvnykh funktsii dvukh peremennykh”, Voprosy teorii priblizhenii funktsii i ee prilozhenii, IMAN USSR, Kiev, 1976, 160–178