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In STOC '09: Proceedings of the 41st annual ACM symposium on Theory of computing (2009), pp. 169-178.
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Electronic Notes in Theoretical Computer Science, Vol. 203, No. 5. (12 June 2008), pp. 131-152.
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Journal of Physics A: Mathematical and Theoretical, Vol. 41, No. 34. (2008), 344004.
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