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Information Processing Letters > 2010 > 110 > 16 > 639-643
Information Processing Letters > 2009 > 109 > 14 > 783-789
Information Processing Letters > 2003 > 85 > 3 > 153-158
Information Processing Letters > 2010 > 110 > 16 > 639-643
Information Processing Letters > 2009 > 109 > 14 > 783-789
Information Processing Letters > 2003 > 85 > 3 > 153-158