Information Processing Letters
Information Processing Letters > 2005 > 93 > 2 > 75-81
Information Processing Letters > 2005 > 94 > 5 > 211-216
Information Processing Letters > 2005 > 96 > 4 > 128-135
Information Processing Letters > 2005 > 93 > 2 > 75-81
Information Processing Letters > 2005 > 94 > 5 > 211-216
Information Processing Letters > 2005 > 96 > 4 > 128-135