Okonofua, E. S., I. B. Nwadialo, and M. O. Ekun. “MODELING IKPOBA RIVER WATER QUALITY USING PRINCIPAL COMPONENT ANALYSIS (PCA) METHOD AND WATER QUALITY INDEX”. Journal of Civil Engineering, Science and Technology, Vol. 10, no. 1, Apr. 2019, pp. 59-74, doi:10.33736/jcest.1083.2019.