N. V. Zabolotskii and M. R. Mostova, “Logarithmic Derivative and the Angular Density of Zeros for a Zero-Order Entire Function”, Ukr. Mat. Zhurn., vol. 66, no. 4, pp. 473–481, Apr. 2014, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2149