W. T. Al-Mayah and A. M. Rabee, “Application of Overall Index of Pollution (OIP) for the Evaluating of the Water Quality in Al-Gharraf River southern of Iraq”, Iraqi Journal of Science, vol. 59, no. 2A, pp. 660–669, Apr. 2018, Accessed: Jun. 02, 2026. [Online]. Available: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/319