Tao Gu Zhanqing Wu XianPing Tao Hung Keng Pung Jian Lu epSICAR: An Emerging Patterns based Approach to Sequential, Interleaved and Concurrent Activity Recognition. 1-9 2009 PerCom http://dx.doi.org/10.1109/PERCOM.2009.4912776 conf/percom/2009 db/conf/percom/percom2009.html#GuWTPL09