Jianning Ding*, Yan Li, Hongwei Hu, Li Bai, Shuai Zhang and Ningyi Yuan*
* Corresponding authors: Jianning Ding dingjn@cczu.edu.cn - Ningyi Yuan nyyuan@cczu.edu.cn
Nanoscale Research Letters 2013, 8:9 doi:10.1186/1556-276X-8-9
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