Kolomoitsev, Y. S. “Inequalities for the Fractional Derivatives of Trigonometric Polynomials in Spaces With Integral Metrics”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 67, no. 1, Jan. 2015, pp. 42-56, https://umj.imath.kiev.ua/index.php/umj/article/view/1962.