“Using Pollution Load Index (PLI) and Geoaccumulation Index (I-Geo) for the Assessment of Heavy Metals Pollution in Tigris River Sediment in Baghdad Region”. Al-Nahrain Journal of Science, vol. 14, no. 4, Dec. 2011, pp. 108-14, https://anjs.edu.iq/index.php/anjs/article/view/772.