Man Lung Yiu Nikos Mamoulis Spiridon Bakiras Retrieval of Spatial Join Pattern Instances from Sensor Networks. 25 2007 conf/ssdbm/2007 SSDBM http://doi.ieeecomputersociety.org/10.1109/SSDBM.2007.41 db/conf/ssdbm/ssdbm2007.html#YiuMB07