1. GeoSPARQL - a geography query language for RDF data (2016). http://www.opengeospatial.org/standards/geosparql . Accessed 17 Mar 2016
2. National Strategy for Critical Infrastructure Protection (CIP Strategy)
3. Socop, geospatial ontologies (2016). http://ontolog.cim3.net/cgi-bin/wiki.pl?SOCoP/GeospatialOntologies . Accessed 16 Mar 2016
4. Arpinar, I.B., Sheth, A., Ramakrishnan, C., Usery, L., Azami, M.: Po kwan, M.: Geospatial ontology development and semantic analytics. In: Transactions in GIS, pp. 1–15. Blackwell Publishing, Boston (2005)
5. Athanasiou, S., Hladky, D., Giannopoulos, G., Garcia-Rojas, A., Lehmann, J.: GeoKnow: making the web an exploratory place for geospatial knowledge. Eur. Res. Consortium Inf. Math. News 96, 12–13 (2014)