POLYAKOV, E.; VORONTSOV-VELYAMINOV, P. A quantum gas in an external field at finite temperatures. An exact expression for density and exited states. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie), [S. l.], v. 8, n. 14, p. 334–351, 2007. Disponível em: https://en.num-meth.ru/index.php/journal/article/view/275. Acesso em: 29 apr. 2024.