H. . H. A. Al-Eqabi and A. M. H. . Al-Gharbawe, “Effect of Coarse Aggregate Columns on Angle of Friction in Fine Sandy Soil”, WJES, vol. 7, no. 2, pp. 55–61, Aug. 2019, doi: 10.31185/ejuow.Vol7.Iss2.143.