Pichugov, S. A. “Inequalities for Trigonometric Polynomials in Spaces With Integral Metric”. Ukrains’kyi Matematychnyi Zhurnal 63, no. 12 (December 25, 2011): 1657–1671. Accessed April 27, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/2832.