Information Processing Letters
Information Processing Letters > 2010 > 110 > 6 > 211-215
Information Processing Letters > 2010 > 110 > 6 > 203-205
Information Processing Letters > 2010 > 110 > 11 > 439-443
Information Processing Letters > 2010 > 110 > 6 > 211-215
Information Processing Letters > 2010 > 110 > 6 > 203-205
Information Processing Letters > 2010 > 110 > 11 > 439-443