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Tao Zhao Ramakant Nevatia Bo Wu Segmentation and Tracking of Multiple Humans in Crowded Environments. 1198-1211 2008 30 IEEE Trans. Pattern Anal. Mach. Intell. 7 http://doi.ieeecomputersociety.org/10.1109/TPAMI.2007.70770 db/journals/pami/pami30.html#ZhaoNW08