LUO, Chengfang; XIN, Xiaolong; HE, Pengfei. n-FOLD (POSITIVE) IMPLICATIVE FILTERS OF HOOPS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 37, p. 631–642, 2017. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6769. Acesso em: 16 sep. 2026.