By Chun-Dong Hu   Yong-Jian Xu   Yuan-Lai Xie   Sheng Liu   Zhi-Min Liu   Peng Sheng   Ya-Hong Xie   Li-Zhen Liang   in Chinese Physics Letters

ISSN:0256-307X|32|5|52901-52904

IOP Publishing‎(2015)‎

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