PAINHO, M.; PINA, I. The invisible cities - can PPGIS connect citizens to urban policies?. GeoFocus. International Review of Geographical Information Science and Technology, [S. l.], n. 13_1, p. 1–4, 2014. Disponível em: https://geofocus.org/index.php/geofocus/article/view/258. Acesso em: 22 jan. 2025.