R. V. Khats’, “Regularity of growth of fourier coefficients of entire functions of improved regular growth”, Ukr. Mat. Zhurn., vol. 63, no. 12, pp. 1717–1721, Dec. 2011, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2837