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Information Processing Letters > 2003 > 86 > 1 > 13-21
Information Processing Letters > 2002 > 82 > 4 > 179-186
Information Processing Letters > 1997 > 61 > 3 > 149-156
Information Processing Letters > 2003 > 86 > 1 > 13-21
Information Processing Letters > 2002 > 82 > 4 > 179-186
Information Processing Letters > 1997 > 61 > 3 > 149-156