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Theoretical Computer Science > 2008 > 394 > 1-2 > 134-140
Electronic Notes in Theoretical Computer Science > 2007 > 180 > 1 > 77-94
Theoretical Computer Science > 2006 > 356 > 3 > 265-290
Electronic Notes in Theoretical Computer Science > 2005 > 128 > 2 > 5-34