Cheng Chang Rashid Ansari Ashfaq A. Khokhar Cyclic Articulated Human Motion Tracking by Sequential Ancestral Simulation. 45-52 2004 CVPR (2) http://csdl.computer.org/comp/proceedings/cvpr/2004/2158/02/215820045abs.htm db/conf/cvpr/cvpr2004-2.html#ChangAK04