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Wang WM, Gibbon P, Sheng ZM, Li YT.Wang WM, et al. Among authors: sheng zm.Phys Rev Lett. 2015 Jun 26;114(25):253901. doi: 10.1103/PhysRevLett.114.253901. Epub 2015 Jun 23.Phys Rev Lett. 2015.PMID: 26197126Free article.