Vali, Masoumeh. “Intuitionistic Fuzzy $D^*$-Metric Spaceand Some Topological Properties”. Journal of Informatics and Mathematical Sciences 4, no. 2 (July 10, 2012): 205–218. Accessed May 3, 2024. http://rgnpublications.com/journals/index.php/jims/article/view/84.