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L. Backstrom, C. Dwork, and J. Kleinberg. Proceedings of the 16th international conference on World Wide Web, page 181--190. New York, NY, USA, ACM, (2007)
A. Narayanan, and V. Shmatikov. (2009)cite arxiv:0903.3276
Comment: Published in the 30th IEEE Symposium on Security and Privacy, 2009.
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