Acta Mathematica Sinica, English Series
Acta Mathematica Sinica, English Series > 2004 > 20 > 3 > 415-422
Acta Mathematica Sinica, English Series > 2004 > 20 > 5 > 803-806
Acta Mathematica Sinica, English Series > 2004 > 20 > 5 > 803-806
Acta Mathematica Sinica, English Series > 2004 > 20 > 3 > 415-422
Acta Mathematica Sinica, English Series > 2004 > 20 > 5 > 803-806
Acta Mathematica Sinica, English Series > 2004 > 20 > 5 > 803-806