AMAIRANTO, R. M.; ISLA, R. T. Fuzzy Sets in Hyper UP-algebra. European Journal of Pure and Applied Mathematics, [S. l.], v. 14, n. 4, p. 1388–1401, 2021. DOI: 10.29020/nybg.ejpam.v14i4.4143. Disponível em: https://ejpam.com/index.php/ejpam/article/view/4143. Acesso em: 2 feb. 2023.