Appendix 1:     3.3.1:      Small damping, no driving force

Appendix 2:      3.3.2:      Nonlinear Oscillations and chaotic motion

Appendix 3:    3.3.3.1:     Bistable response of the Duffing oscillator

Appendix 4a: 3.3.3.2:     Perturbation series solution of the Duffing oscillator up to lambda^2-terms

Appendix 4b: 3.3.3.2:     Perturbation series solution of the Duffing oscillator up to lambda^5-terms

Appendix 5:         4.5:     Interaction of 2 solitons (analytical)