Elias Frentzos Kostas Gratsias Nikos Pelekis Yannis Theodoridis Nearest Neighbor Search on Moving Object Trajectories. 328-345 2005 conf/ssd/2005 SSTD http://dx.doi.org/10.1007/11535331_19 db/conf/ssd/sstd2005.html#FrentzosGPT05