A. Najam, L., A. M.A. Ismail, and M. A. Hmood. “Study of the Efficiency of Some Quaternary Alloys (Al-Cu-Pb-Zn) in Attenuating Gamma Radiation”. Rafidain Journal of Science, vol. 34, no. 4, Dec. 2025, pp. 102-9, https://jeh.uomosul.edu.iq/index.php/rsci/article/view/56056.