M. M. Sheremeta, “On the Radii of univalence of Gel’fond-Leont’ev derivatives”, Ukr. Mat. Zhurn., vol. 47, no. 3, pp. 390–399, Mar. 1995, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5428