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G. Stone, C. Ophus, T. Birol, J. Ciston, C-H. Lee, K. Wang, C.J. Fennie, D.G. Schlom, N. Alem, and V. Gopalan, “Atomic Scale Imaging of Competing Polar States in a Ruddlesden-Popper Layered Oxide,” Nature Communications 7 (2016) 12572-1 – 12572-6.