Savchuk, V. V. “Best Approximations of the Cauchy – Szegö Kernel in the Mean on the Unit Circle”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 5 (May 25, 2018): 708-714. Accessed March 29, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1589.