Muhammad Salman khan and Syed Muhammad Ali (2019) “Optimization of Prestress U-Tub Girder of Lahore Orange Line Metro Train”, International Journal of Advance Engineering and Research Development (IJAERD), 6(7), pp. 57–60. Available at: https://ijaerd.org/index.php/IJAERD/article/view/4320 (Accessed: 6 July 2025).