Investigation of nonlinear effects in glassy matter using dielectric methods P. Lunkenheimer, M. Michl, Th. Bauer and A. Loidl Eur. Phys. J. Special Topics, 226 14 (2017) 3157-3183 Published online: 10 August 2017 DOI: 10.1140/epjst/e2017-70075-7