Sam, M. L., A. Saptari, M. R. Salleh, and K. E. Chong. “Properties of Optimal Solution of Indefinite Matrix Constraint in Linear Programming”. Journal of Advanced Manufacturing Technology (JAMT) 11, no. 1(1) (October 17, 2017): 129-138. Accessed July 3, 2024. https://jamt.utem.edu.my/jamt/article/view/2836.