Fei Liu*, Lifang Li, Tongyi Guo, Haibo Gan, Xiaoshu Mo, Jun Chen, Shaozhi Deng and Ningsheng Xu
* Corresponding author: Fei Liu liufei@mail.sysu.edu.cn
Nanoscale Research Letters 2012, 7:454 doi:10.1186/1556-276X-7-454
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