Team, Support. “$S_\beta$-Open Sets and $S_\beta$-Continuity in Topological Spaces: Alias B. Khalaf, Nehmat K. Ahmed”. Thai Journal of Mathematics 11, no. 2 (August 1, 2013): 319–335. Accessed April 28, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/380.