A. K. Verma, S. K. Gupta, K. K. Singh, and H. S. Chauhan, “Design of Bi-Level Drainage Systems: An Analytical Solution Using Inversion Theorem”, JAE, vol. 44, no. 4, Dec. 2007, Accessed: Jun. 30, 2026. [Online]. Available: https://epubs.icar.org.in/index.php/JAE/article/view/14465