Basu, C. K., and B. M. Uzzal Afsan. “$P_\omega$-Closedness and Its Generalization With Respect to a Grill”. Sarajevo Journal of Mathematics 7, no. 2 (June 10, 2024): 297–309. Accessed January 26, 2026. https://www.sjm.anubih.ba/index.php/sjm/article/view/298.