Totur, Ümit, and İbrahim Çanak. “Some Tauberian Theorems for the Weighted Mean Method of Summability of Double Sequence”. Ukrains’kyi Matematychnyi Zhurnal 75, no. 9 (September 26, 2023): 1276–1293. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/509.