Vlasyk, H. M. “Bernstein – Nikol’skii-Type Inequalities for Trigonometric Polynomials With an Arbitrary Choice of Harmonics”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 2 (February 25, 2017): 147–156. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/1683.