KRAGH, Helge. Positronium Chemistry: Origin, Development, and Historical Roots. Substantia, [S. l.], v. 9, n. 2, p. 9–19, 2025. DOI: 10.36253/Substantia-3540. Disponível em: https://riviste.fupress.net/index.php/subs/article/view/3540. Acesso em: 8 nov. 2025.