N. Kehayopulu, “Fuzzy Right (Left) Ideals in Hypergroupoids and Fuzzy Bi-ideals in Hypersemigroups”, Armen.J.Math., vol. 10, no. 3, pp. 1–10, Jun. 2018, Accessed: May 09, 2026. [Online]. Available: http://test.armjmath.sci.am/index.php/ajm/article/view/196