DzyubenkoH. A., ListopadV. V., and ShevchukI. A. “Uniform Estimates for Monotonic Polynomial Approximation”. Ukrains’kyi Matematychnyi Zhurnal 45, no. 1 (January 25, 1993): 38–43. Accessed October 6, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5780.