Fu-Che Wu Wan-Chun Ma Rung-Huei Liang Bing-Yu Chen Ming Ouhyoung Domain connected graph: the skeleton of a closed 3D shape for animation. 117-135 2006 22 The Visual Computer 2 http://dx.doi.org/10.1007/s00371-005-0357-4 db/journals/vc/vc22.html#WuMLCO06