Koshe Hareru, Werku, Firew Belayneh Asfaw, and Tewodros Ghebrab. 2022. “Physical and Chemical Characterization of Coffee Husk Ash Effect on Partial Replacement of Cement in Concrete Production”. International Journal of Sustainable Construction Engineering and Technology 13 (1):167-84. https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/9509.