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Information Processing Letters > 2007 > 105 > 1 > 20-25
Theoretical Computer Science > 2007 > 377 > 1-3 > 170-180
Information Processing Letters > 2007 > 101 > 6 > 227-232
Applied Mathematics Letters > 2006 > 19 > 2 > 140-145
Information Processing Letters > 2003 > 88 > 6 > 287-292