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3. A. O. Leont’eva, “Bernstein–Szegő inequality for the Weyl derivative of trigonometric polynomials in $$L_{0}$$,” Proc. Steklov Inst. Math. 308 (Suppl. 1), S127–S134 (2020).
https://doi.org/10.1134/S0081543820020108
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5. N. I. Akhiezer, Lectures on Approximation Theory (Nauka, Moscow, 1965) [in Russian].