1. Abraham, R., & Shaw, C. [1982], Dynamics: The Geometry of Behavior. Part Three: Global Behavior, Aerial Press, Santa Cruz, California.
2. Bensimon, D., & Kadanoff, L. P. [1984], Extended chaos and disappearance of KAM trajectories, Physica 13 D, 82.
3. Channell, P. J., & Scovel, J. C. [1988], Symplectic integration of Hamiltonian systems, preprint.
4. Chirikov, B. V. [1979], A universal instability of many-dimensional oscillator systems, Physics Reports 52, 263.
5. Easton, R. W. [1985], Trellises formed by stable and unstable manifolds in the plane, Transaction of the A.M.S. 294, 719?732.