Hasan, M Babul, and Md Toha. “An Improved Subgradiend Optimization Technique for Solving IPs With Lagrangean Relaxation”. Dhaka University Journal of Science 61, no. 2 (November 18, 2013): 135–140. Accessed November 21, 2024. https://banglajol.info/index.php/DUJS/article/view/17059.