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N.  Liu, Zhang, S., and Zhang, Y., ?Robust zero-watermarking algorithm for CAD models?, Journal of Digital Information Management, vol. 11, no. 3, pp. 240 - 243, 2013.

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Y.  Zhang, Milios, E., and Zincir-Heywood, N., ?A comparative study on key phrase extraction methods in automatic Web Site Summarization?, Journal of Digital Information Management, vol. 5, no. 5, pp. 323 - 332, 2007.

Y.  Zhang, Orgun, M. A., and Lin, W., ?Unsupervised learning aided by clustering and local-global hierarchical analysis in knowledge exploration?, Journal of Digital Information Management, vol. 5, no. 4, pp. 237 - 246, 2007.