Information Processing Letters
Information Processing Letters > 2006 > 99 > 2 > 68-71
Information Processing Letters > 2007 > 102 > 2-3 > 85-91
Information Processing Letters > 2007 > 104 > 4 > 146-151
Information Processing Letters > 2008 > 105 > 5 > 206-211
Information Processing Letters > 2008 > 107 > 3-4 > 102-106
Information Processing Letters > 2008 > 108 > 6 > 347-351
Information Processing Letters > 2009 > 109 > 7 > 343-346
Information Processing Letters > 2013 > 113 > 9 > 354-356