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Acta Mathematica Hungarica > 2016 > 148 > 1 > 17-42
Acta Mathematicae Applicatae Sinica, English Series > 2014 > 30 > 3 > 819-832
Acta Mathematica Hungarica > 2013 > 140 > 4 > 363-376
Acta Mathematica Hungarica > 2013 > 140 > 1-2 > 71-89
Acta Mathematica Hungarica > 2012 > 135 > 3 > 213-228