Miyoung Cho Chang Choi Junho Choi Hongryoul Yi PanKoo Kim Trajectory Annotation and Retrieval Based on Semantics. 251-264 2007 Adaptive Multimedia Retrieval http://dx.doi.org/10.1007/978-3-540-79860-6_20 conf/amr/2007 db/conf/amr/amr2007.html#ChoCCYK07