Bhatia, Anand K. “Excitations of the 4F and 5F States of Atomic Hydrogen by Positron Impact”. Journal of Atomic, Molecular, Condensed Matter and Nano Physics 11, no. 1 (December 31, 2024): 23–28. Accessed June 17, 2025. http://www.journals.rgnpublications.com/index.php/jamcnp/article/view/2680.