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Information and Computation > 2012 > 214 > Complete > 59-85
Electronic Notes in Theoretical Computer Science > 2006 > 156 > 1 > 97-113
Theoretical Computer Science > 2006 > 354 > 3 > 421-440
Information and Computation > 2012 > 214 > Complete > 59-85
Electronic Notes in Theoretical Computer Science > 2006 > 156 > 1 > 97-113
Theoretical Computer Science > 2006 > 354 > 3 > 421-440