M. T. Audu, D. N. Mbaezue, and S. Dauda. “THE ENGINEERING CHARACTERISTICS OF BLACK COTTON SOIL TREATED WITH CORN STRAW ASH”. International Journal of Advance Engineering and Research Development (IJAERD) 6, no. 10 (October 25, 2019): 74–80. Accessed July 7, 2025. https://ijaerd.org/index.php/IJAERD/article/view/4427.