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Acta Mathematica Sinica, English Series > 2005 > 21 > 3 > 457-464
Acta Mathematica Sinica, English Series > 2005 > 21 > 3 > 457-464
Acta Mathematica Sinica, English Series > 2001 > 17 > 4 > 631-642
Acta Mathematica Sinica, English Series > 2005 > 21 > 3 > 457-464
Acta Mathematica Sinica, English Series > 2005 > 21 > 3 > 457-464
Acta Mathematica Sinica, English Series > 2001 > 17 > 4 > 631-642