BHATIA, A. K. Excitation of (1s2s) 1S, the Singlet State of Helium Atoms by Positron Impact. Journal of Atomic, Molecular, Condensed Matter and Nano Physics, [S. l.], v. 12, n. 1, 2025. Disponível em: https://www.journals.rgnpublications.com/index.php/jamcnp/article/view/3180. Acesso em: 26 oct. 2025.