Arshad, I., and M. M. Babar. “Finite Element Analysis of Seepage and Exit Gradient through a Non-Homogeneous Earth Dam Without Filter Drain”. International Journal of Alternative Fuels and Energy, vol. 1, no. 1, June 2017, pp. 1-8, https://www.psmjournals.org.aabms.pk/index.php/ijafe/article/view/121.