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Indagationes Mathematicae > 2013 > 24 > 3 > 626-636
Journal of Mathematical Analysis and Applications > 2004 > 295 > 1 > 134-143
Indagationes Mathematicae > 2013 > 24 > 3 > 626-636
Journal of Mathematical Analysis and Applications > 2004 > 295 > 1 > 134-143