Information Processing Letters
Information Processing Letters > 2004 > 90 > 2 > 87-92
Information Processing Letters > 2004 > 90 > 3 > 129-134
Information Processing Letters > 2004 > 90 > 4 > 205-208
Information Processing Letters > 2004 > 90 > 2 > 87-92
Information Processing Letters > 2004 > 90 > 3 > 129-134
Information Processing Letters > 2004 > 90 > 4 > 205-208