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, vol. 12, no. 2, June 2021, pp. 285-94, https://doi.org/10.26713/cma.v12i2.1479.