A Sajjanar, Veeresha, and Basavaraj M. Ittanagi. “On WS Closed and WS Open Maps in Topological Spaces”. International Journal of Engineering & Technology 7, no. 4.10 (October 2, 2018): 869–872. Accessed December 22, 2024. https://sciencepubco.com/index.php/ijet/article/view/26777.