Ekeocha, Rowland Jerry Okechukwu, Chukwunedum Uzor, and Clement Anetor. “The Use of the Duality Principle to Solve Optimization Problems”. International Journal of Recent Contributions from Engineering, Science & IT (iJES) 6, no. 1 (March 19, 2018): pp. 33–42. Accessed November 22, 2024. https://online-journals.org/index.php/i-jes/article/view/8224.