1. “Simplest” paths;Duckham,2003
2. Ontologies in support of activities in geographical space;Kuhn;International Journal of Geographical Information Science,2001
3. Ontologies of wayfinding;Timpf;Networks and Spatial Economics,2002
4. REAL;Wahlster;Informatik Forschung und Entwicklung,2001
5. Spatial Cognition III. Routes and Navigation, Human Memory and Learning, Spatial Representation and Spatial Learning,2003