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Discrete Mathematics > 2012 > 312 > 20 > 3046-3058
Computers and Mathematics with Applications > 2010 > 60 > 9 > 2629-2638
Journal of Combinatorial Theory, Series A > 2004 > 106 > 1 > 159-164
Discrete Mathematics > 2012 > 312 > 20 > 3046-3058
Computers and Mathematics with Applications > 2010 > 60 > 9 > 2629-2638
Journal of Combinatorial Theory, Series A > 2004 > 106 > 1 > 159-164