Al-Eqabi , Haqi H. Abbood, and Ali M. Hassan Al-Gharbawee. “Effect of Coarse Aggregate Columns on Angle of Friction in Fine Sandy Soil”. Wasit Journal of Engineering Sciences, vol. 7, no. 2, Aug. 2019, pp. 55-61, https://ejuow.uowasit.edu.iq/index.php/ejuow/article/view/146.