El-Shafei, M. E., M. Abo-elhamayel, and Tareq Al-shami. “On Supra R-Open Sets and Some Applications on Topological Spaces”. Journal of Progressive Research in Mathematics 8, no. 2 (July 7, 2016): 1237-1248. Accessed May 1, 2024. http://scitecresearch.com/journals/index.php/jprm/article/view/797.