## List of main publications

1. Ie.Yu. Ovsii, Approximation of classes of continuous periodic functions by generalized sums, Zb. Pr. Inst. Mat. NAN Ukr., 4:1 (2007), 212–246, (in Ukrainian).
2. A.S. Serdyuk and Ie.Yu. Ovsii, Approximation on classes of entire functions by de la Vallee Poussin sums, Zb. Pr. Inst. Mat. NAN Ukr., 5:1 (2008), 334–351, (in Ukrainian).
3. A.S. Serdyuk and Ie.Yu. Ovsii, Approximation of classes $C^\psi_\beta H_\omega$ by generalized Zygmund sums, Ukr. Math. J., 61:4 (2009), 524–537.
4. Ie.Yu. Ovsii, Approximation of classes $C^\psi_\beta H_\omega$ by generalized trigonometric polynomials, Institute of Mathematics of NASU, Preprint, 2 (2009), 104 pages, (in Ukrainian).
5. A Serdyuk and I. Ovsii, On the best approximation of certain classes of periodic functions by trigonometric polynomials, Azerbaijan Journal of Mathematics, 1:1 (2011), 129–144.

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