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Results in Mathematics > 2013 > 63 > 3-4 > 1177-1193
Acta Mathematica Hungarica > 2012 > 135 > 3 > 213-228
Acta Mathematica Hungarica > 2012 > 135 > 3 > 193-212
Journal of Approximation Theory > 2007 > 147 > 2 > 205-214
Acta Mathematica Scientia > 2006 > 26 > 4 > 610-614
Journal of Approximation Theory > 2005 > 137 > 1 > 57-88
Acta Mathematica Hungarica > 2005 > 107 > 1-2 > 119-147
Journal of Approximation Theory > 2003 > 125 > 2 > 198-237