Spyros Sioutas Konstantinos Tsakalidis Kostas Tsichlas Christos Makris Yannis Manolopoulos Indexing Mobile Objects on the Plane Revisited. 189-204 2007 conf/adbis/2007 ADBIS http://dx.doi.org/10.1007/978-3-540-75185-4_15 db/conf/adbis/adbis2007.html#SioutasTTMM07