Information Processing Letters
Information Processing Letters > 2004 > 90 > 6 > 279-285
Information Processing Letters > 2004 > 90 > 6 > 273-278
Information Processing Letters > 2004 > 90 > 6 > 293-299
Information Processing Letters > 2004 > 90 > 6 > 307-313
Information Processing Letters > 2004 > 90 > 6 > 301-305