Khalaf, Alias Barakat, and Sarhad F. Namiq. “\(\lambda _{c}\)-Open Sets and \(\lambda _{c}\)-Separation Axioms in Topological Spaces”. Journal of Advanced Studies in Topology 4, no. 1 (December 18, 2012): 150:158. Accessed March 2, 2021. http://www.m-sciences.com/index.php/jast/article/view/528.