Ibrahim, I. A., Y. U. Saeed, M. Abbagana, and A. Y. Suleiman. “Application of Response Surface Method in Predicting and Optimizing the Engineering Properties of Activated Metakaolin Treated Non-Lateritic Soil”. African Journal of Advances in Science and Technology Research, vol. 13, no. 1, Jan. 2024, pp. 38-57, https://publications.afropolitanjournals.com/index.php/ajastr/article/view/707.