Approach to equilibrium via Tsallis distributions in a realistic ionic-crystal model and in the FPU modelAndrea Carati, Luigi Galgani, Fabrizio Gangemi and Roberto GangemiEur. Phys. J. Special Topics, 229 5 (2020) 743-749DOI: https://doi.org/10.1140/epjst/e2020-900203-y