Information Processing Letters
Information Processing Letters > 2004 > 89 > 3 > 105-110
Information Processing Letters > 2006 > 100 > 3 > 97-104
Information Processing Letters > 2008 > 108 > 2 > 82-86
Information Processing Letters > 2011 > 111 > 21-22 > 1057-1061
Information Processing Letters > 2014 > 114 > 10 > 561-563