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Acta Mathematica Sinica, English Series > 2005 > 21 > 2 > 423- 434
Acta Mathematica Sinica, English Series > 2005 > 21 > 2 > 423-434
Applied Mathematics and Computation > 2004 > 148 > 2 > 381-392
Acta Mathematica Sinica, English Series > 2005 > 21 > 2 > 423- 434
Acta Mathematica Sinica, English Series > 2005 > 21 > 2 > 423-434
Applied Mathematics and Computation > 2004 > 148 > 2 > 381-392