Abbas, Jasim M., Qassun S. Mohammed Shafiqu, and Mohd R. Taha. 2008. “Effect of Shape and Slenderness Ratio on the Behavior of Laterally Loaded Piles”. Nahrain University College of Engineering Journal 11 (1): 19-27. https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/492.