Gupta, Suresh Prasad, and Raju Khanal. “Application of Binary Encounter Approximation and Electron Impact on Ionization of Atoms”. Patan Pragya 8, no. 01 (December 31, 2021): 174–186. Accessed December 7, 2025. https://www.nepjol.info/index.php/pragya/article/view/42432.