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Information Processing Letters > 2010 > 110 > 17 > 753-756
Theoretical Computer Science > 2008 > 403 > 2-3 > 265-284
Information Processing Letters > 1995 > 56 > 4 > 209-214
Information Processing Letters > 2010 > 110 > 17 > 753-756
Theoretical Computer Science > 2008 > 403 > 2-3 > 265-284
Information Processing Letters > 1995 > 56 > 4 > 209-214