1. Shekhar, S., Chawla, S.: Spatial Databases: A Tour. Pearson Education. Upper Saddle River, New Jersey (2003)
2. Randell, D.A., Cui, Z., Cohn, A.G.: A Spatial Logic based on Regions and Connections. In: Nebel, B., Rich, C., Swartout, W. (eds.) Principles of Knowledge Representation and Reasoning, pp. 165–176. Morgan Kaufmann, San Mateo (1992)
3. Bennett, B.: Logics for Topological Reasoning. In: 12th European Summer School in Logic, Language and Information (ESSLLI-MM), Birmingham, UK, August 2000, pp. 6–18 (2000)
4. Patel-Schneider, P.F., Hayes, P., Horrocks, I.: OWL Web Ontology Language: Semantics and Abstract Syntax. W3C Recommendation, February 10, 2004. World Wide Web Consortium (2004)
5. Grütter, R., Bauer-Messmer, B., Hägeli, M.: Extending an Ontology-based Search with a Formalism for Spatial Reasoning. In: Proceedings of the 23rd Annual ACM Symposium on Applied Computing (ACM SAC 2008), pp. 2266–2270. ACM, New York (2008)