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Acta Mathematica Scientia > 2014 > 34 > 5 > 1446-1460
Applied Mathematics and Computation > 2004 > 159 > 2 > 485-493
Acta Mathematica Scientia > 2014 > 34 > 5 > 1446-1460
Applied Mathematics and Computation > 2004 > 159 > 2 > 485-493