Information Processing Letters
Information Processing Letters > 1995 > 54 > 6 > 307-312
Information Processing Letters > 1997 > 62 > 6 > 289-294
Information Processing Letters > 1999 > 71 > 3-4 > 107-113
Information Processing Letters > 2002 > 83 > 1 > 1-6
Information Processing Letters > 2003 > 85 > 6 > 293-299
Information Processing Letters > 2006 > 99 > 1 > 33-39
Information Processing Letters > 2008 > 108 > 3 > 124-126
Information Processing Letters > 2014 > 114 > 10 > 529-534