Sanabria, J., E. Rosas, and VásquezL. “On Inversely $\theta$-Semi-Open and Inversely $\theta$-Semi-Closed Functions”. Matematychni Studii 53, no. 1 (March 17, 2020): 92-99. Accessed April 26, 2024. http://matstud.org.ua/ojs/index.php/matstud/article/view/26.