Omidi, S., B. Davvaz, and K. Hila. “Characterizations of Regular and Intra-Regular Ordered $\Gamma$-Semihypergroups in Terms of Bi-$\Gamma$-Hyperideals”. Carpathian Mathematical Publications 11, no. 1 (June 30, 2019): 136–151. Accessed July 3, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/1515.