SIMULIK, V. M.; GORDIEVICH, I. O. Symmetries of Relativistic Hydrogen Atom. Ukrainian Journal of Physics, [S. l.], v. 64, n. 12, p. 1148, 2019. DOI: 10.15407/ujpe64.12.1148. Disponível em: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019521. Acesso em: 24 apr. 2024.