A review of recent progress in understanding the spontelectric state of matter Oksana Plekan, Alexander Rosu-Finsen, Andrew M. Cassidy, Jérôme Lasne, Martin R.S. McCoustra and David Field Eur. Phys. J. D, 71 6 (2017) 162 Published online: 20 June 2017 DOI: 10.1140/epjd/e2017-80048-3