James, Jijo. “Strength Benefit of Sawdust/Wood Ash Amendment in Cement Stabilization of an Expansive Soil”. Revista Facultad de Ingeniería 28, no. 50 (January 10, 2010): 44-61. Accessed August 18, 2019. https://revistas.uptc.edu.co/index.php/ingenieria/article/view/8790.