Bidkham, M., and E. Khojastehnezhad. “Inequalities for Complex Rational Functions”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 7 (July 20, 2021): 879 - 886. Accessed August 13, 2022. http://umj.imath.kiev.ua/index.php/umj/article/view/455.