Carsten Keßler Martin Raubal Christoph Wosniok Semantic Rules for Context-Aware Geographical Information Retrieval. 77-92 2009 EuroSSC http://dx.doi.org/10.1007/978-3-642-04471-7_7 conf/eurossc/2009 db/conf/eurossc/eurossc2009.html#KesslerRW09