ILLERIS, Sven; PEDERSEN, Poul O. Central Places and Functional Regions in Denmark: Factor Analysis of Telephone Traffic. Geografisk Tidsskrift, [S. l.], v. 67, n. 1, p. 1–18, 1968. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/129060. Acesso em: 6 dec. 2025.