Orumu S.T, and Nelson T.A. “Introduction into Mix Ratio Matrix Analysis of Concrete for the Determination of Cement Grade”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE 4, no. 11 (November 5, 2018): 291–296. Accessed April 26, 2024. https://ijasre.net/index.php/ijasre/article/view/792.