Time-dependent properties in two-dimensional and Hamiltonian mappings A.L.P. Livorati, J.A. de Oliveira, D.G. Ladeira and E.D. Leonel Eur. Phys. J. Special Topics, 223 13 (2014) 2953-2958 Published online: 10 December 2014 DOI: 10.1140/epjst/e2014-02308-6