“The Effect of Pre-used Oil of Cars Mixed with Salt Resistance Cement on Collapsibility of Gypseous Soil”, J. eng. sustain. dev., vol. 13, no. 1, pp. 47–57, Mar. 2009, Accessed: May 20, 2024. [Online]. Available: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1528