O. Ravi, M. Suresh, and A. Pandi. “π-Generalized Closed Sets With Respect to an Ideal”. International Journal of Current Research in Science and Technology 1, no. 5 (May 31, 2015): 53-58. Accessed January 15, 2025. https://crst.gfer.org/index.php/crst/article/view/28.