ShvaiA. I., AntonyukP. E., DzyadykS. Yu., and ZaritskayaZ. V. “Approximation of the $| X |^r$ Function and Its Derivatives”. Ukrains’kyi Matematychnyi Zhurnal 42, no. 6 (June 19, 1990): 821-826. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8845.