Information Processing Letters
Information Processing Letters > 1995 > 53 > 1 > 49-54
Information Processing Letters > 1997 > 62 > 5 > 251-254
Information Processing Letters > 2004 > 92 > 4 > 199-205
Information Processing Letters > 2013 > 113 > 5-6 > 151-155
Information Processing Letters > 2017 > 127 > C > 43-48