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Journal of Combinatorial Theory, Series B > 2004 > 91 > 1 > 67-86
Annals of Combinatorics > 2004 > 8 > 3 > 303-323
Journal of Combinatorial Theory, Series B > 2004 > 91 > 1 > 67-86
Annals of Combinatorics > 2004 > 8 > 3 > 303-323