WANG, Qiumei; ZHAN, Jianming. A NOVEL VIEW OF ROUGH SOFT SEMIGROUPS BASED ON FUZZY IDEALS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 37, p. 673–686, 2017. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6667. Acesso em: 5 sep. 2026.