Daniel Cotting Tim Weyrich Mark Pauly Markus H. Gross Robust Watermarking of Point-Sampled Geometry. 233-242 2004 conf/smi/2004 SMI http://doi.ieeecomputersociety.org/10.1109/SMI.2004.51 db/conf/smi/smi2004.html#CottingWPG04