Information Processing Letters
Information Processing Letters > 2010 > 110 > 16 > 702-706
Information Processing Letters > 2011 > 111 > 23-24 > 1089-1091
Information Processing Letters > 2010 > 110 > 16 > 702-706
Information Processing Letters > 2011 > 111 > 23-24 > 1089-1091