Massa’deh, Mourad Oqla, and Ahlam Fellatah. “On Hyper Q-Fuzzy Normal HX Subgroup, Conjugate and Its Normal Level”. Italian Journal of Pure and Applied Mathematics 42 (July 30, 2019): 624–634. Accessed October 27, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/7203.