Acta Mathematica Hungarica
Acta Mathematica Hungarica > 2016 > 150 > 2 > 441-455
Acta Mathematica Hungarica > 2016 > 150 > 2 > 524-540
Acta Mathematica Hungarica > 2016 > 150 > 2 > 441-455
Acta Mathematica Hungarica > 2016 > 150 > 2 > 524-540