A. A. Temur and A. B. . Kadhim, “Determination the density of cometary nucleus material using gamma ray attenuation”, Iraqi Journal of Science, vol. 57, no. 2C, pp. 1572–1583, Jun. 2022, Accessed: Jun. 25, 2026. [Online]. Available: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/7234