### 论文：

1． Li W, Yang D and Zhang X. Unramified extensions of quadratic fields, Prog. Natural Sci., 2008, 18: 323-324

2． Xing C and Li W. A $2\times 2$ lattice space-time code of rank 5, Proc. Amer. Math. Soc., 2008, 136: 3415-3418

3． Li W and Zhang X. Parametrization of the quadratic function fields whose divisor
class numbers are divisible by three, Acta Mathematica Sinica

4． Ma L, Li W and Zhang X. Congruence Formulae Modulo Powers of 2 for class numbers of cyclic quartic fields, Sci. China Series A

5． Zhao Y, Li W and Zhang X. Effective determination of prime decompositions of cubic function fields, International Journal of Number Theory