1. Hirth, J. P. & Lothe, J. Theory of Dislocations (Krieger Publishing, Malabar, UK, ed. 2, 1992).
2. Wang, L. H., Zhang, Z. & Han, X. D. In situ experimental mechanics of nanomaterials at the atomic scale. NPG Asia Mater. 5, 40 (2013).
3. Chokshi, A. H., Rosen, A., Karch, J. & Gleiter, H. On the validity of the hall-petch relationship in nanocrystalline materials. Scripta Mater. 23, 1679 (1989).
4. Liu, P., Mao, S. C., Wang, L. H., Han, X. D. & Zhang, Z. Direct dynamic atomic mechanisms of strain-induced grain rotation in nanocrystalline, textured, columnar-structured thin gold films.Scripta Mater. 64, 343 (2011).
5. Van Swygenhoven, H. Grain boundaries and dislocations. Science 296, 66 (2002).