Acta Mathematica Sinica, English Series
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 209-222
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 209- 222
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 209-222
Acta Mathematica Sinica, English Series > 2004 > 20 > 2 > 209- 222