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Acta Mathematica Sinica, English Series > 2001 > 17 > 1 > 89-102
Acta Mathematica Sinica, English Series > 2001 > 17 > 1 > 89-102
Acta Mathematica Sinica, English Series > 2001 > 17 > 1 > 89-102
Acta Mathematica Sinica, English Series > 2001 > 17 > 1 > 89-102