Electron Impact Excitation Cross Sections of the $1s2s$ $^3S$ Metastable State of Helium. Journal of Atomic and Molecular Sciences, [S. l.], v. 3, n. 1, p. 49–58, 2012. DOI: 10.4208/jams.041811.050911a. Disponível em: https://www.global-sci.com/index.php/jams/article/view/14616. Acesso em: 5 dec. 2025.