Oluwatudimu, O. E., Sadeeq, J. A., and Osinubi, K. J. “Improvement of the Index and Compaction Characteristics of Black Cotton Soil With Palm Kernel Shell Ash”. International Journal of Engineering and Management Research 10, no. 2 (April 30, 2020): 121–130. Accessed July 3, 2024. https://ijemr.vandanapublications.com/index.php/ijemr/article/view/280.