Acta Mathematica Sinica, English Series
Acta Mathematica Sinica, English Series > 2004 > 20 > 3 > 441-452
Acta Mathematica Sinica, English Series > 2004 > 20 > 3 > 405-414
Acta Mathematica Sinica, English Series > 2004 > 20 > 5 > 785-792
Acta Mathematica Sinica, English Series > 2004 > 20 > 5 > 785-792