SUBBER, A. R. H., M. A. ALI, and W. H. ALMOSAWY. “Gamma-Ray Measurements of Naturally Occurring Radioactive Materials in Sludge, Scale and Well Cores of the Oil Industry in Southern Iraq”. Walailak Journal of Science and Technology (WJST), vol. 11, no. 9, Dec. 2013, pp. 739-50, https://wjst.wu.ac.th/index.php/wjst/article/view/552.