Marcin Gorawski Kamil Dowlaszewicz Optimization of Top-k Spatial Preference Queries' Execution Process Based on Similarity of Preferences. 140-151 2008 New Trends in Multimedia and Network Information Systems series/faia/2008-181 db/series/faia/faia181.html#GorawskiD08 http://dx.doi.org/10.3233/978-1-58603-904-2-140