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Information Processing Letters > 2010 > 110 > 10 > 420-423
Information Processing Letters > 2009 > 109 > 16 > 887-896
Information Processing Letters > 2005 > 94 > 6 > 247-252
Information Processing Letters > 2004 > 91 > 6 > 251-257
Information Processing Letters > 2004 > 90 > 2 > 65-72
Information Processing Letters > 2001 > 80 > 2 > 87-95
Information Processing Letters > 1998 > 65 > 2 > 63-66