Krzysztof Janowicz Marc Wilkes Michael Lutz Similarity-Based Information Retrieval and Its Role within Spatial Data Infrastructures. 151-167 2008 GIScience http://dx.doi.org/10.1007/978-3-540-87473-7_10 conf/giscience/2008 db/conf/giscience/giscience2008.html#JanowiczWL08