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Periodica Mathematica Hungarica > 2017 > 75 > 1 > 58-65
Journal of Mathematical Analysis and Applications > 2014 > 414 > 2 > 641-655
Periodica Mathematica Hungarica > 2017 > 75 > 1 > 58-65
Journal of Mathematical Analysis and Applications > 2014 > 414 > 2 > 641-655