Nanni, Arthur Schmidt, and Alexandre De Oliveira Chaves. 2011. “Uso De Aplicativos Computacionais Livres Em Disciplinas De Mapeamento geológico”. GeoFocus. International Review of Geographical Information Science and Technology, no. 11 (December):55-65. https://www.geofocus.org/index.php/geofocus/article/view/230.