1. Arnold, V.I.: 1963, Proof of A.N. Kolmogorov’s theorem on the preservation of quasiperiodic motions under small perturbations of the Hamiltonian, Usp. Mat. Nauk SSSR 18, no. 5, p.13
2. Aubry, S.: 1978, in Bishop, A.R. and Schneider, T (eds.) Solitons and Condensed Matter Physics, Springer, p. 264
3. Contopoulos, G.: 1971, Orbits in Highly Perturbed Systems III, Astron. J.76, 147
4. Contopoulos, G., Voglis, N., Efthymiopoulos, C., Froeschlé, C., Gonczi, R., Lega, E., Ivorak, R., Lohinger, E.: 1997, Transition Spectra of L ynamical Systems, Cel. Mech. Dyn. Astr.67, 393
5. Contopoulos, G., Voglis, N.: 1996, Spectra of Stretching Numbers and Helicity Angles in I ynamical Systems, Cel. Mech. Dyn. Astr.64, 1