Attah, I. C., Okafor, F. O. ., & Ugwu, O. O. . (2021). Experimental and optimization study of unconfined compressive strength of ameliorated tropical black clay. Engineering and Applied Science Research, 48(3), 238–248. retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/241469