KESORN, Bodin; MAIMUN, Khanrudee; RATBANDAN, Watchara; IAMPAN, Aiyared. INTUITIONISTIC FUZZY SETS IN UP-ALGEBRAS: UP-algebra. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 34, p. 339–364, 2015. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6374. Acesso em: 7 aug. 2026.