Sören Auer Jens Lehmann Sebastian Hellmann LinkedGeoData: Adding a Spatial Dimension to the Web of Data. 731-746 2009 International Semantic Web Conference http://dx.doi.org/10.1007/978-3-642-04930-9_46 conf/semweb/2009 db/conf/semweb/iswc2009.html#AuerLH09