O. V. Motornaya, V. P. Motornyi, and P. K. Nitiema, “One-sided approximation of a step by algebraic polynomials in the mean”, Ukr. Mat. Zhurn., vol. 62, no. 3, pp. 409–422, Mar. 2010, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2876