Jinyun Li, Daqiang Gao, Xiaoning Niu, Mingsu Si* and Desheng Xue*
* Corresponding authors: Mingsu Si sims@lzu.edu.cn - Desheng Xue xueds@lzu.edu.cn
Nanoscale Research Letters 2012, 7:624 doi:10.1186/1556-276X-7-624
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