Kenneth Miebaka Oba, and Ichebadu George Amadi. “A Predictive Mathematical Model for Water Absorption of Sawdust Ash - Sand Concrete”. International Journal of Engineering and Management Research, Vol. 10, no. 1, Feb. 2020, pp. 33-41, http://www.ijemr.net/ojs/index.php/ojs/article/view/242.