Ibrahim, Shatha Amer, Mahmood Fadhil Abed, and Balsam Salim Al-Tawash. 2018. “Calculation of Pollution Indicators and Health Hazards of Heavy Elements in Surface Soils in Samarra City”. Iraqi Journal of Science 59 (3B), 1419-29. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/443.