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Indagationes Mathematicae > 2014 > 25 > 1 > 24-34
Applied Mathematics and Computation > 2006 > 182 > 2 > 1355-1360
Journal of Mathematical Analysis and Applications > 2004 > 299 > 2 > 375-391
Journal of Mathematical Analysis and Applications > 2000 > 250 > 2 > 579-588
Journal of Mathematical Analysis and Applications > 1999 > 238 > 1 > 297-304