Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms (2006) - Comment
doi: 10.1016/j.nimb.2005.10.034  issn: 0168-583x 

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L.B. Zhou, W.J. Li, S. Ma, X.C. Dong, L.X. Yu, Q. Li, G.M. Zhou, Q.X. Gao