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Results in Mathematics > 2009 > 54 > 1-2 > 41-52
Acta Mathematica Hungarica > 2005 > 107 > 1-2 > 71-75
Periodica Mathematica Hungarica > 2004 > 49 > 2 > 35-44
Results in Mathematics > 2009 > 54 > 1-2 > 41-52
Acta Mathematica Hungarica > 2005 > 107 > 1-2 > 71-75
Periodica Mathematica Hungarica > 2004 > 49 > 2 > 35-44