Safdar, M. ., T. Shaukat, Z. . Khan, Waliullah, I. Jamil, M. . Waseem, and N. . Ahmad. “Experimental and Numerical Modelling of Helical Piles Subjected to Lateral Loading”. Journal of Himalayan Earth Sciences, vol. 54, no. 2, Nov. 2021, pp. 84-94, http://ojs.uop.edu.pk/jhes/article/view/1707.