GAO, Xiao Li; XIN, Xiao Long; ZHAN, Jian Ming. Some types of filters and states on hyper NM-algebras. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 42, p. 880–898, 2019. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7174. Acesso em: 27 oct. 2026.