Hu, W.B., Liu, Y., Withers, R.L., Frankcombe, T.J., Noren, L., SnashAll, A., Kitchin, M., Smith, P., Gong, B., Chen, H., Schiemer, J., Brink, F. and Wong-Leung, J. (2013) Electron-Pinned Defect-Dipoles for High-Performance Colossal Permittivity Materials. Nature Materials, 12, 821-826.