Iampan, Aiyared, and Manoj Siripitukdet. 2013. “DESCRIBING GREEN’S RELATIONS IN ORDERED Γ-GROUPOIDS USING A NEW CONCEPT: FUZZY SUBSETS”. Italian Journal of Pure and Applied Mathematics 31 (December):125-40. https://journals.uniurb.it/index.php/ijpam/article/view/6157.