Xinru Li, Yanhui Zhang, Yating Fan, Yanxia Zhou, Xiaoning Wang, Chao Fan, Yan Liu* and Qiang Zhang*
* Corresponding authors: Yan Liu yanliu@bjmu.edu.cn - Qiang Zhang zqdodo@bjmu.edu.cn
Nanoscale Research Letters 2011, 6:275 doi:10.1186/1556-276X-6-275
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