Acta Mathematica Sinica, English Series
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 367-378
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 367-378
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 367-378
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 367-378