### Inequalities of Jackson type for ridge and polynomial approximation of harmonic functions

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Babenko V.F., Levchenko D.A. "Uniformly distributed ridge approximation of certain classes of harmonic functions", *Ukrainian Math. J.*, 2012; 64(10): pp. 1427-1432. (in Russian)

Zhuk V.V. "Some sharp inequalities between uniform approximations of periodic functions", *Dokl. AN SSSR*, 1967; 201: pp. 263-266. (in Russian)

Korneichuk N.P. "Exact constant in Jackson theorem of the best uniform appproximation of continuous periodic functions", *Dokl. AN SSSR*, 1962; 145: pp. 514-515. (in Russian)

Korneichuk N.P. "On exact constant in Jackson theorem for continuous periodic functions", *Matem. zametki*, 1982; 32(5): pp. 669-674. (in Russian)

Korneichuk N.P. *Extremum problems in approximation theory*, Moscow, 1976; 320 p. (in Russian)

Ligun A.A. "On exact constants of approximation of differentiable periodic functions", *Matem. zametki*, 1973; 14(1): pp. 21-30. (in Russian)

Chernykh N.I. "On Jackson inequality in $$$L_2$$$", *Trudy MIAN SSSR*, 1967; 88: pp. 71-74. (in Russian)

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