UDTEN, Napharat; SONGSEANG, Natthanan; IAMPAN, Aiyared. TRANSLATION AND DENSITY OF A BIPOLAR-VALUED FUZZY SET IN UP-ALGEBRAS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 41, p. 469–496, 2019. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7104. Acesso em: 17 oct. 2026.