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Applied Mathematics and Computation > 2011 > 218 > 8 > 4152-4160
Journal of Mathematical Analysis and Applications > 2007 > 328 > 2 > 1075-1081
Applied Mathematics and Computation > 2011 > 218 > 8 > 4152-4160
Journal of Mathematical Analysis and Applications > 2007 > 328 > 2 > 1075-1081