Boonpok, Chawalit, and Chokchai Viriyapong. “On (Λ, P)-Closed Sets and the Related Notions in Topological Spaces”. European Journal of Pure and Applied Mathematics 15, no. 2 (April 30, 2022): 415–436. Accessed July 6, 2022. https://ejpam.com/index.php/ejpam/article/view/4274.