Tariq Hashim, Hashim, and Dr. Mohammed Mosleh Salman. “Experimental Study for Ability to Use Plaster of Pairs Instead of Normal Concrete”. International Journal of Engineering & Technology, vol. 7, no. 4.20, Nov. 2018, pp. 185-90, https://doi.org/10.14419/ijet.v7i4.20.25923.