FORBUS, K. D.; USHER, J.; CHAPMAN, V. Qualitative Spatial Reasoning about Sketch Maps. AI Magazine, [S. l.], v. 25, n. 3, p. 61, 2004. DOI: 10.1609/aimag.v25i3.1777. Disponível em: https://ojs.aaai.org/aimagazine/index.php/aimagazine/article/view/1777. Acesso em: 29 mar. 2024.