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Peng, Fei, Guo, Re-Si, Li, Chang-Tsun and Long, Min (2010) A semi-fragile watermarking algorithm for authenticating 2D CAD engineering graphics based on log-polar transformation. Computer-Aided Design, Vol.42 (No.12). pp. 1207-1216. doi:10.1016/j.cad.2010.08.004 ISSN 0010-4485.