P.B. Yusuf , Darius, K.M. Koko, and Yusuf Usman Mok. “Performance of an Economy System Using Linear Algebraic Solution”. GIS Business 14, no. 3 (June 18, 2019): 15-23. Accessed April 18, 2024. https://gisbusiness.org/index.php/gis/article/view/1960.