Acta Mathematica Sinica, English Series
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 305-318
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 305- 318
Acta Mathematica Sinica, English Series > 2004 > 20 > 6 > 1079-1088
Acta Mathematica Sinica, English Series > 2004 > 20 > 6 > 1079-1088