Chaichenko, S. O. “Approximation of the Bergman Kernels by Rational Functions With Fixed Poles”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 11 (November 25, 2017): 1577-1584. Accessed October 5, 2022. http://umj.imath.kiev.ua/index.php/umj/article/view/1804.