SOUZA, T. X. R.; MACEDO, C. A. Calculation of thermodynamic properties of the Hubbard model using perturbation theory. Scientia Plena, [S. l.], v. 8, n. 3(b), 2012. Disponível em: https://www.scientiaplena.org.br/sp/article/view/985. Acesso em: 17 may. 2024.