K. A. Kopotun, D. Leviatan, and I. A. Shevchuk, “Are the degrees of the best (co)convex and unconstrained polynomial approximations the same? II”, Ukr. Mat. Zhurn., vol. 62, no. 3, pp. 369–386, Mar. 2010, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2873