H. Al-Shamma S, سالم, I. Azawi M, مزاحم. A suitable analytical formula for the K shell ionization cross section of carbon and potassium atoms by electron impact. EDUSJ [Internet]. 2013 Aug. 1 [cited 2025 Aug. 4];26(3):18-22. Available from: https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17431