PETER, C.; SINGH, D. Redefined Submultiset-based Multiset Ordering via Grid. Asian Journal of Fuzzy and Applied Mathematics, [S. l.], v. 3, n. 6, 2016. Disponível em: https://www.ajouronline.com/index.php/AJFAM/article/view/3241. Acesso em: 5 may. 2024.