NitiemaP. K. “On the Best $L_1$-Approximation of Truncated Powers by Algebraic Polynomials”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 4 (April 25, 1998): 593-598. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4930.