Faisal I. Bashir Ashfaq A. Khokhar Dan Schonfeld Real-Time Motion Trajectory-Based Indexing and Retrieval of Video Sequences. 58-65 2007 9 IEEE Transactions on Multimedia 1 http://dx.doi.org/10.1109/TMM.2006.886346 db/journals/tmm/tmm9.html#BashirKS07