H. A. Dzyubenko, V. V. Listopad, and I. A. Shevchuk, “Uniform estimates for monotonic polynomial approximation”, Ukr. Mat. Zhurn., vol. 45, no. 1, pp. 38–43, Jan. 1993, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5780