Information Processing Letters
Information Processing Letters > 1995 > 54 > 1 > 35-39
Information Processing Letters > 1995 > 54 > 5 > 249-251
Information Processing Letters > 1995 > 56 > 6 > 299-306
Information Processing Letters > 2012 > 112 > 12 > 473-478
Information Processing Letters > 2015 > 115 > 9 > 699-702