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Applied Mathematics and Computation > 2011 > 218 > 3 > 1136-1141
Applied Mathematics and Computation > 2011 > 218 > 3 > 843-850
Applied Mathematics and Computation > 2007 > 187 > 1 > 176-182
Applied Mathematics and Computation > 2003 > 145 > 2-3 > 341-350