Vakarchuk, S. B. “On the Moduli of Continuity and Fractional-Order Derivatives in the Problems of Best Mean-Square Approximations by Entire Functions of the Exponential Type on the Entire Real Axis”. Ukrains’kyi Matematychnyi Zhurnal, vol. 69, no. 5, May 2017, pp. 599-23, https://umj.imath.kiev.ua/index.php/umj/article/view/1720.