Elshafei, Mervat M. “Fully Fuzzy Quadratic Programming With Unrestricted Fully Fuzzy Variables and Parameters”. Journal of Progressive Research in Mathematics 15, no. 3 (October 23, 2019): 2654-2667. Accessed May 5, 2024. http://www.scitecresearch.com/journals/index.php/jprm/article/view/1770.