H. AL-SHAMMA, S.; I. AZAWI, M.; H. ISMAIL, L. An analytical expression for the K shell ionization cross section of some heavy atomic elements by electron impact. Journal of Education and Science (JES), [S. l.], v. 24, n. 4, p. 123–130, 1970. DOI: 10.33899/edusj.1970.58959. Disponível em: https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23539. Acesso em: 6 aug. 2025.