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Mathematica Slovaca > 2014 > 64 > 3 > 555-562
Algebra universalis > 2009 > 60 > 1 > 107-124
Annals of Combinatorics > 2005 > 9 > 4 > 431-450
Discrete Mathematics > 2001 > 241 > 1-3 > 41-50
Electronic Notes in Discrete Mathematics > 2000 > 5 > Complete > 77-80