E. A. EL-Alfi, H. Abu-El-Naga. “Preparation and Characterization of Non-Expansive Rich-Belite Sulfoaluminate Cement”. International Journal of Advanced Science and Technology, Vol. 29, no. 11s, June 2020, pp. 714 -22, http://sersc.org/journals/index.php/IJAST/article/view/20040.