TAAGEPERA, Rein; KASKLA, Edgar. The City-Country Rule: An Extension of the Rank-Size Rule. Journal of World-Systems Research, [S. l.], v. 7, n. 2, p. 157–173, 2001. DOI: 10.5195/jwsr.2001.168. Disponível em: https://jwsr.pitt.edu/ojs/jwsr/article/view/168. Acesso em: 22 apr. 2026.