Moshe Blank Lena Gorelick Eli Shechtman Michal Irani Ronen Basri Actions as Space-Time Shapes. 1395-1402 2005 conf/iccv/2005 ICCV http://doi.ieeecomputersociety.org/10.1109/ICCV.2005.28 db/conf/iccv/iccv2005-2.html#BlankGSIB05