MATTAM, Anju S.; GOPALAN, Sasi. Rough approximate operators based on fuzzy soft relation. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 43, p. 912–925, 2020. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7276. Acesso em: 28 oct. 2026.