Information Processing Letters
Information Processing Letters > 2013 > 113 > 4 > 145-150
Information Processing Letters > 2013 > 113 > 5-6 > 188-192
Information Processing Letters > 2013 > 113 > 12 > 434-439
Information Processing Letters > 2013 > 113 > 4 > 145-150
Information Processing Letters > 2013 > 113 > 5-6 > 188-192
Information Processing Letters > 2013 > 113 > 12 > 434-439