CHENG, Xiao Yun; XIN, Xiao Long. FILTER THEORY ON HYPER BE-ALGEBRAS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 35, p. 509–526, 2015. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6403. Acesso em: 16 aug. 2026.