Hamid, Emad Yagoub, and Mohammed Hassan Osman Abushaba. 2020. “Use of Exponential Holt Model and the Box-Jenkins Methodology in Predicting the Time Series of Cement Production in Sudan”. Journal of Al-Qadisiyah for Computer Science and Mathematics 12 (1):Math Page 42 – 59. https://doi.org/10.29304/jqcm.2020.12.1.666.