Yacob, Suhaila, Mohd Amran Md Ali, Qumrul Ahsan, Nurulhuda Arifin, and Rafidah Ali. 2018. “A Brief Review of Grey Fuzzy Logic Technique Research Progression from 2010 to 2016”. International Journal of Engineering and Technology 7 (2.29): 41-42. https://doi.org/10.14419/ijet.v7i2.29.13125.