By Chao Zhang   Shi-Feng Du   Yan-Xiong Niu   Cai-Li Wang   Zhi-Chao Wang   Jia-Lin Xu   Yong Bo   Qin-Jun Peng   Da-Fu Cui   Zu-Yan Xu   in Chinese Physics Letters

ISSN:0256-307X|31|4|44201-44203

IOP Publishing‎(2014)‎

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