V. A. Kofanov, “Inequalities of Different Metrics for Differentiable Periodic Functions, Polynomials, and Splines”, Ukr. Mat. Zhurn., vol. 53, no. 5, pp. 597–609, May 2001, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4283