Dyachenko, M. I., Nursultanov, Y. D. and Zhantakbayeva, A. M. (2013) “Hardy-Littlewood type theorems”, Eurasian Mathematical Journal, 4(2), pp. 140–143. Available at: https://emj.enu.kz/index.php/main/article/view/533 (Accessed: 9 October 2025).