Y. Simsek, “On Generalized Hardy Sums $s_5(h, k)$”, Ukr. Mat. Zhurn., vol. 56, no. 10, pp. 1434–1440, Oct. 2004, Accessed: Apr. 13, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3856