![](/images/ico/ico_close.png)
![](/images/ico/ico5.png)
Author: Zhang Zheng Wang Zhi
Publisher: Springer Publishing Company
ISSN: 1439-8516
Source: Acta Mathematica Sinica, Vol.21, Iss.1, 2005-02, pp. : 95-108
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.