Abo-Elhamayel, M., and Zabidin Salleh. “New Separation Axioms in Bitopological Spaces”. The Journal of the Indian Mathematical Society 86, no. 3-4 (August 22, 2019): 211–229. Accessed April 28, 2024. https://www.informaticsjournals.com/index.php/jims/article/view/22160.