1. Ballatore, A., D.C. Wilson and M. Bertolotto. 2012. Geographic Knowledge Extraction and Semantic Similarity in Open Street Map, Knowledge and Information Systems (KAIS), Springer, DOI: 10.1007/s10115-012-0571-0.10.1007/s10115-012-0571-0
2. Ontology-driven geographic information integration: A survey of current approaches
3. Building a global normalized ontology for integrating geographic data sources