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Acta Mathematica Hungarica > 2005 > 108 > 1-2 > 117-127
Acta Mathematica Hungarica > 2005 > 108 > 3 > 253-259
Algebra universalis > 2005 > 53 > 2-3 > 189-210
Acta Mathematica Hungarica > 2005 > 108 > 1-2 > 117-127
Acta Mathematica Hungarica > 2005 > 108 > 3 > 253-259
Algebra universalis > 2005 > 53 > 2-3 > 189-210