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Applied Mathematics and Computation > 2011 > 217 > 23 > 9567-9574
Journal of Mathematical Analysis and Applications > 2009 > 359 > 2 > 642-652
Applied Mathematics and Computation > 2011 > 217 > 23 > 9567-9574
Journal of Mathematical Analysis and Applications > 2009 > 359 > 2 > 642-652