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Discrete Mathematics > 2010 > 310 > 4 > 877-886
Information Processing Letters > 2003 > 86 > 5 > 263-269
Information Processing Letters > 1999 > 72 > 1-2 > 55-63
Discrete Mathematics > 2010 > 310 > 4 > 877-886
Information Processing Letters > 2003 > 86 > 5 > 263-269
Information Processing Letters > 1999 > 72 > 1-2 > 55-63