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 August 18, 2025. https://www.journals.rgnpublications.com/index.php/cma/article/view/1479.