B. Amudhambigai, G. Vasuki, and A. Ramya. “A View on Contra-Fr-B-Continuous M-Set Functions in Multiset Topological Spaces”. International Journal of Mathematics And its Applications 6, no. 3 (September 15, 2018): 349–356. Accessed May 4, 2024. http://ijmaa.in/index.php/ijmaa/article/view/389.