BANDARU, Ravi Kumar; SHUM, K.P.; RAFI, N. FUZZY IDEALS OF IMPLICATION GROUPOIDS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 34, p. 277–290, 2015. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6369. Acesso em: 7 aug. 2026.