Li, M. Y., Wondergem, H. J., Spijkman, M. J., Asadi, K., Katsouras, I., Blom, P. W. M., et al. (2013). Revisiting the delta-phase of poly(vinylidene fluoride) for solution-processed ferroelectric thin films. Nature Materials, 12(5), 433-438. doi:10.1038/NMAT3577.