Information Processing Letters
Information Processing Letters > 1996 > 60 > 1 > 43-47
Information Processing Letters > 2006 > 98 > 3 > 107-114
Information Processing Letters > 2010 > 110 > 11 > 431-438
Information Processing Letters > 1996 > 60 > 1 > 43-47
Information Processing Letters > 2006 > 98 > 3 > 107-114
Information Processing Letters > 2010 > 110 > 11 > 431-438