Nassef MH, and Khater AM. “Analysis of Uranium Concentration, and 235U/238U Activity Ratio in Low Grade Uranium Ore Material by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Gamma Ray Spectrometry Technique”. International Journal of Life Sciences, vol. 4, no. 4, Jan. 2017, pp. 461-6, https://ijlsci.in/ls/index.php/home/article/view/1331.