Kartal, Bağdagül. “Necessary and Sufficient Conditions for the Inclusion Relation Between Two Summability Methods”. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica 22 (March 28, 2023): 5–11. Accessed April 25, 2024. https://studmath.uken.krakow.pl/article/view/10153.