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Theoretical Computer Science > 2008 > 390 > 1 > 70-80
Theoretical Computer Science > 2007 > 377 > 1-3 > 170-180
Information Processing Letters > 2007 > 101 > 6 > 227-232
Theoretical Computer Science > 2008 > 390 > 1 > 70-80
Theoretical Computer Science > 2007 > 377 > 1-3 > 170-180
Information Processing Letters > 2007 > 101 > 6 > 227-232