P. Lloveras, E. Stern-Taulats, M. Barrio, J.-Ll. Tamarit, S. Crossley, W. Li, V. Pomjakushin, A. Planes, Ll. Mañosa, N. D. Mathur and X. Moya, "Giant barocaloric effects at low pressure in ferrielectric ammonium sulphate", Nature Communications 6 (2015) 8801.