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Information Processing Letters > 2009 > 109 > 16 > 887-896
Information Processing Letters > 2003 > 85 > 6 > 307-315
Information Processing Letters > 1997 > 62 > 4 > 193-199
Information Processing Letters > 2009 > 109 > 16 > 887-896
Information Processing Letters > 2003 > 85 > 6 > 307-315
Information Processing Letters > 1997 > 62 > 4 > 193-199