GAVIRIA RÍOS, Mario Alberto. External network economies in the city system of the Colombian coffee growing axis (Efe Cafetero), 1996-2014. Semestre Económico, [S. l.], v. 21, n. 48, p. 105–125, 2018. DOI: 10.22395/seec.v21n48a4. Disponível em: https://revistas.udem.edu.co/index.php/economico/article/view/2769. Acesso em: 22 apr. 2026.