Chang-Min Chou Din-Chang Tseng Affine-Transformation-Invariant Public Fragile Watermarking for 3D Model Authentication. 72-79 2009 29 IEEE Computer Graphics and Applications 2 http://doi.ieeecomputersociety.org/10.1109/MCG.2009.20 db/journals/cga/cga29.html#ChouT09