B. V. Vynnyts’kyi and V. Sharan, “On zeros of functions of given proximate formal order analytic in a half-plane”, Ukr. Mat. Zhurn., vol. 51, no. 7, pp. 904–909, Jul. 1999, Accessed: Apr. 23, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4679