Yao Yao, Xiangdong Chen*, Jinfeng Zhu, Baoqing Zeng, Zuquan Wu and Xiaoyu Li
* Corresponding author: Xiangdong Chen xdchen@home.swjtu.edu.cn
Nanoscale Research Letters 2012, 7:363 doi:10.1186/1556-276X-7-363
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