Mohammed Ahmed, Hasan, and Rafal Naheth Wadie. “Properties of Self Compacting Concrete Containing Limestone Powder As Replacement of Sand”. Journal of Engineering and Sustainable Development, vol. 15, no. 3, Sept. 2011, pp. 118-31, https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1353.