Savaş, E. “$I_\lambda$-Double Statistical Convergence of Order $α$ in Topological Groups”. Ukrains’kyi Matematychnyi Zhurnal 68, no. 9 (September 25, 2016): 1251–1258. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/1918.