Information Processing Letters
Information Processing Letters > 2013 > 113 > 8 > 293-300
Information Processing Letters > 2013 > 113 > 9 > 345-349
Information Processing Letters > 2013 > 113 > 12 > 440-443
Information Processing Letters > 2013 > 113 > 17 > 604-608
Information Processing Letters > 2013 > 113 > 19-21 > 832-835