[1]
N. A. Davydov, “On necessary and sufficient conditions for the summability of a numerical series to imply its convergence”, Ukr. Mat. Zhurn., vol. 47, no. 6, pp. 747–754, Jun. 1995, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5467