1. A method for determining a stochastic transition;Greene;J. Math. Phys.,1979
2. Topics in Non-linear Dynamics;Helleman,1978
3. Transport in Hamiltonian systems;MacKay;Physica,1984
4. M. Peygrad and S. Aubry, Critical behaviour at the transition by breaking of symmetry in the discrete Frenkel-Kontorova Model, J. Phys. C, to appear.