Awasthi, Anurag, and Sudhir Kumar Srivastava. “A Fuzzy Soft Set Theoretic Approach in Decision Making of Covid-19 Risk in Different Regions”. Communications in Mathematics and Applications 12, no. 2 (June 30, 2021): 285–294. Accessed April 6, 2025. http://rgnpublications.com/journals/index.php/cma/article/view/1479.