I. E. Chyzhykov., “On a complete description of the class of functions without zeros analytic in a disk and having given orders”, Ukr. Mat. Zhurn., vol. 59, no. 7, pp. 979–995, Jul. 2007, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3360