P. K. Nitiema, “On the best $L_1$-approximation of truncated powers by algebraic polynomials”, Ukr. Mat. Zhurn., vol. 50, no. 4, pp. 593–598, Apr. 1998, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4930