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The Ramanujan Journal > 2010 > 23 > 1-3 > 127-135
Journal of Combinatorial Theory, Series A > 2008 > 115 > 1 > 1-31
Journal of Combinatorial Theory, Series A > 2006 > 113 > 4 > 567-590
Acta Mathematica Hungarica > 2006 > 112 > 1-2 > 25-37