DOI:https://doi.org/10.1103/PhysRevLett.108.189906
© 2012 American Physical Society
Huajun Qin, Junren Shi, Yanwei Cao, Kehui Wu, Jiandi Zhang, E. W. Plummer, J. Wen, Z. J. Xu, G. D. Gu, and Jiandong Guo
Vol. 108, Iss. 18 — 4 May 2012
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