Gzar, Dr. Hatem Asal, and Israa Mohammed Gatea. “Batch and Column Extraction of Lead from Al-Doura Oil Refinery Soil”. Journal of Petroleum Research and Studies 7, no. 1 (May 1, 2017): 118-142. Accessed February 11, 2026. https://jprs.gov.iq/index.php/jprs/article/view/168.