CALMAR ANDERSEN, Simon. Multilevel-modeller. Politica, [S. l.], v. 39, n. 3, p. 294–316, 2007. DOI: 10.7146/politica.v39i3.69867. Disponível em: https://tidsskrift.dk/politica/article/view/69867. Acesso em: 6 dec. 2025.