FENG, Xinyang; TANG, Jian; LUO, Yanfeng. A STUDY ON PSEUDOORDERS IN ORDERED ∗-SEMIHYPERGROUPS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 39, p. 178–193, 2018. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6938. Acesso em: 7 oct. 2026.