Ali, A. K. “X-Ray Repair Cross Complementing 4 (XRCC4) Gene Expressions As Biomarkers for Detection of Ionizing Radiation Exposure”. University of Thi-Qar Journal of Science, Vol. 4, no. 2, July 2019, pp. 23-30, https://www.jsci.utq.edu.iq/index.php/main/article/view/590.