Wang, Qiumei, and Jianming Zhan. “A NOVEL VIEW OF ROUGH SOFT SEMIGROUPS BASED ON FUZZY IDEALS”. Italian Journal of Pure and Applied Mathematics 37 (January 31, 2017): 673–686. Accessed September 5, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/6667.