Bandura, A.I., and N.V. Petrechko. “Properties of Power Series of Analytic in a Bidisc Functions of Bounded $\mathbf{L}$-Index in Joint Variables”. Carpathian Mathematical Publications 9, no. 1 (June 8, 2017): 6–12. Accessed December 14, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/1441.