MOSKALENKO, V.; DOHOTARU, L.; DIGOR, D.; CEBOTARI, I. Stationary property of the thermodynamic potential of the Hubbard model in strong coupling diagrammatic approach for superconducting state. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 38, n. 10, p. 1167–1174, 2012. DOI: 10.1063/1.4758767. Disponível em: https://fnt.ilt.kharkov.ua/index.php/fnt/article/view/f38-1167e. Acesso em: 3 трав. 2024.