Full Text Article Available at:
http://www.sciencedirect.com/science/article/B6WKD-4SWP27S-1/2/877bc0fcff2283...
Authors: Jin Yuan*, Zhi-Juan Lu*, Schmidt Asmus**
*Department of Mathematics, Northwest University, Xi'an 710127, People's
Republic of China
**Matematisk Institut, Universitetsparken5, Copenhagen DK-2100,Denmark.
Email:luzhijuan_2004_2004@yahoo.com.cn
Manuscript Number: JNT-D-07-00302R1
All Comments