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V. P. Motornyi, “On one inequality for the moduli of smoothness of periodic functions with a bounded derivative,” Dokl. Akad. Nauk SSSR,154, No. 1, 45–47 (1964).
V. P. Motornyi, “On one inequality for the moduli of smoothness of periodic functions,” in: First Republican Math. Conf. Young Researchers [in Russian], No. 2, Izd. Institute Matematika, Akad. Nauk UkrSSR, Kiev (1965).
S. M. Nikol'skii, “Approximation of functions by trigonometic polynomials in the mean,” Izv. Akad. Nauk SSSR, Ser. Matem.,10 (1946).
A. F. Timan and V. N. Trofimov, “Difference inequalities for functions harmonic in a circle,” Dokl. Akad. Nauk SSSR,173, No. 4 (1967).
V. N. Trofimov and A. S. Tsygankov, “Exact inequalities for the oscillations of functions harmonic and biharmonic in a circle,” Sibirsk. Matem. Zh.,10, No. 2 (1969).
Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 27, No. 5, pp. 708–709, September–October, 1975.