KEA, R. A. Expansions and Contractions: World-Historical Change And The Western Sudan World-System (1200/1000 B.C. ? 1200/1250 A.D.). Journal of World-Systems Research, [S. l.], v. 10, n. 3, p. 723–816, 2004. DOI: 10.5195/jwsr.2004.286. Disponível em: https://jwsr.pitt.edu/ojs/jwsr/article/view/286. Acesso em: 19 apr. 2024.