STEPANOVSKY, Y. P. Square Roots of Kepler Ellipses, Electrons and Rydberg Atoms in a Magnetic Field. Ukrainian Journal of Physics, [S. l.], v. 65, n. 10, p. 835, 2020. DOI: 10.15407/ujpe65.10.835. Disponível em: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2020196. Acesso em: 28 nov. 2020.