PETER, C.; SINGH, D. Grid Ramification of Set-based Multiset Ordering. Asian Journal of Fuzzy and Applied Mathematics, [S. l.], v. 1, n. 3, 2013. Disponível em: https://www.ajouronline.com/index.php/AJFAM/article/view/321. Acesso em: 12 may. 2024.