Yuxiao Hu Liangliang Cao Fengjun Lv Shuicheng Yan Yihong Gong Thomas S. Huang Action detection in complex scenes with spatial and temporal ambiguities. 128-135 2009 ICCV http://dx.doi.org/10.1109/ICCV.2009.5459153 conf/iccv/2009 db/conf/iccv/iccv2009.html#HuCLYGH09