Information Processing Letters
Information Processing Letters > 2012 > 112 > 6 > 238-242
Information Processing Letters > 2012 > 112 > 6 > 249-251
Information Processing Letters > 2012 > 112 > 11 > 418-422
Information Processing Letters > 2012 > 112 > 6 > 238-242
Information Processing Letters > 2012 > 112 > 6 > 249-251
Information Processing Letters > 2012 > 112 > 11 > 418-422