Li Li David Zhang Zhigeng Pan Jiaoying Shi Kun Zhou Kai Ye Watermarking 3D mesh by spherical parameterization. 981-989 2004 28 Computers & Graphics 6 http://dx.doi.org/10.1016/j.cag.2004.08.002 db/journals/cg/cg28.html#LiZPSZY04