M. Lellis Thivagar, V. Antonysamy, and M. Arockia Dasan. “Revelation of Nano Topology in $\check{C}$ech Rough Closure Spaces”. International Journal of Mathematics And its Applications 6, no. 1 - A (January 1, 2018): 121–131. Accessed May 17, 2024. http://ijmaa.in/index.php/ijmaa/article/view/905.