CONSTABLE, Edwin C. The Short and Sad Life of Helvetium – an Element that Never Was: Chemical Education. CHIMIA, [S. l.], v. 73, n. 6, p. 507–508, 2019. DOI: 10.2533/chimia.2019.507. Disponível em: https://www.chimia.ch/chimia/article/view/2019_507. Acesso em: 18 may. 2024.