Angelo Ribeiro, Miguel. “ABORDAGENS ANALÍTICAS DAS REDES GEOGRÁFICAS - DOI 10.5216 Bgg.V20i1.4229”. Goiano Bulletin of Geography, vol. 20, no. 1, July 2008, pp. 77-106, https://doi.org/10.5216/bgg.v20i1.4229.