SOBOL, O. O. Variational Method for the Calculation of Critical Distance Between Two Coulomb Centers in Graphene. Ukrainian Journal of Physics, [S. l.], v. 59, n. 5, p. 531, 2018. DOI: 10.15407/ujpe59.05.0531. Disponível em: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018479. Acesso em: 20 apr. 2024.