Abdullayev, G. A. “On Some Properties of Orthogonal Polynomials over an Area in Domains of the Complex Plane. III”. Ukrains’kyi Matematychnyi Zhurnal 53, no. 12 (December 25, 2001): 1588–1599. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4380.