By Yang Jimin   Liu Jie   He Jingliang   in Optik – International Journal for Light and Electron Optics

ISSN:0030-4026|115|12|538-540

Urban & Fischer‎(2004)‎

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By He Jing   Liang Ying   Kou Su-peng   in EPL (EUROPHYSICS LETTERS)

ISSN:0295-5075|112|1|17010-17010

Edp Sciences‎(2015)‎

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