VASILIEV, I. Geographic Information Systems: A Visual Approach. Cartographic Perspectives, [S. l.], n. 27, p. 36–37, 1997. DOI: 10.14714/CP27.706. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp27-vasiliev. Acesso em: 30 apr. 2024.