Discrete Mathematics
Discrete Mathematics > 2011 > 311 > 13 > 1220-1222
Discrete Mathematics > 2011 > 311 > 15 > 1461-1471
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Discrete Mathematics > 2011 > 311 > 20 > 2143-2147
Discrete Mathematics > 2011 > 311 > 21 > 2485-2489