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Applied Mathematics and Computation > 2009 > 215 > 4 > 1448-1455
Applied Mathematics Letters > 2007 > 20 > 12 > 1218-1222
Applied Mathematics and Computation > 2009 > 215 > 4 > 1448-1455
Applied Mathematics Letters > 2007 > 20 > 12 > 1218-1222