By Tong Ran   Yang Zhaorong   Shen Chen   Zhu Xuebing   Sun Yuping   Li Li   Zhang Shile   Pi Li   Qu Zhe   Zhang Yuheng   in EPL (EUROPHYSICS LETTERS)

ISSN:0295-5075|89|5|57002-57002

Edp Sciences‎(2010)‎

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