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Journal of Graph Theory > 104 > 4 > 836 - 850
Discrete Mathematics > 2010 > 310 > 3 > 442-452
Discussiones Mathematicae Graph Theory > 2010 > 30 > 1 > 115-122
Journal of Combinatorial Theory, Series B > 2006 > 96 > 6 > 881-900
Discrete Mathematics > 2000 > 212 > 1-2 > 101-109