H. ISMAIL, L.; H. AL-SHAMMA, S.; I. AZAWI, M. An analytical expression for the K shell ionization cross section of some heavy atomic elements by electron impact. Journal of Education and Science, [S. l.], v. 24, n. 4, p. 123–130, 1970. DOI: 10.33899/edusj.1970.58959. Disponível em: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41690. Acesso em: 10 sep. 2025.