A review of the dynamical susceptibility in different complex systems A. Coniglio, T. Abete, A. de Candia, E. Del Gado and A. Fierro Eur. Phys. J. Special Topics, 161 (2008) 45-54 Published online: 19 June 2008 DOI: 10.1140/epjst/e2008-00749-0