Y. Al-Khayyat, B. and S. Al-Dabbagh, S. (2005) “Using Fuzzy Logic to Construction of Expert Computer Model for Forecast of Compressive Strength of the Portland Cement”, AL-Rafidain Journal of Computer Sciences and Mathematics, 2(2), pp. 29–49. doi: 10.33899/csmj.2005.164087 .