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A. I. Stepanets, Uniform Approximation by Trigonometric Polynomials [in Russian], Naukova Dumka, Kiev (1981).
I. K. Daugovet, “Lebesgue's construction of double Fourier series,” in: Computing Methods [in Russian], No. 6, Leningrad State Univ. (1970), pp. 8–13.
A. I. Stepanets, “The approximation by Fourier sums of functions satisfying the Lipschitz conditions,” Ukr. Mat. Zh.,24, No. 6, 781–799 (1972).
V. K. Dzyadyk and A. I. Stepanets, “The sequence of zeros of the integrated sine,” in: Metric Problems in the Theory of Functions and Transformations [in Russian], Vol. II, Naukova Dumka, Kiev (1971), pp. 64–73.
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 35, No. 2, pp. 249–254, March–April, 1983.
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Stepanets, A.I., Rukasov, V.I. Approximation by triangular fourier sums on classes of continuous periodic functions of two variables. Ukr Math J 35, 215–220 (1983). https://doi.org/10.1007/BF01088940
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DOI: https://doi.org/10.1007/BF01088940