SavchukV. V., and ChaichenkoS. O. “Best Approximations for the Cauchy Kernel on the Real Axis”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 11 (November 25, 2014): 1540–1549. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2244.