Raad A. Hamza, Amar Maula, Jarallah Muhsin, and Talib M. Mahmoud. “Determination the Contamination Level of Mercury Due to Occupational Work ”. Journal of Madenat Alelem University College, Vol. 5, no. 1, June 2013, pp. 5-15, http://116.203.176.164/index.php/JMAUC/article/view/220.