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European Spatial Research and Policy > 2018 > 25 > 1 > 55-74
Afrika Matematika > 2016 > 27 > 1-2 > 279-290
Computational Methods and Function Theory > 2013 > 13 > 2 > 205-223
Annales UMCS, Mathematica > 2008 > 62 > 1 > 61-65
Acta Mathematica Hungarica > 2004 > 104 > 1-2 > 115-126
European Spatial Research and Policy > European Spatial Research and Policy Volume 25 (2018) Issue 1