Savchuk, V. V., and O. I. Stepanets. “Approximation of Cauchy-Type Integrals”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 5 (May 25, 2002): 706–740. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4110.