Kalatalova, M.A. (1971) “$(C)$-property of the Cesaro summation methods of binary series ”, Ukrains’kyi Matematychnyi Zhurnal, 23(3), pp. 391–399. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8569 (Accessed: 6 December 2025).