Raad A. Hamza, Amar Maula, Jarallah Muhsin, and Talib M. Mahmoud. 2013. “Determination the Contamination Level of Mercury Due to Occupational Work ”. Journal of Madenat Alelem University College 5 (1), 5-15. http://116.203.176.164/index.php/JMAUC/article/view/220.