1. French AP (1968) Special relativity. Cambridge: Thomas Nelson & Sons. 167 p.
2. McComb WD (1999) Dynamics and Relativity. Oxford: Oxford University Press. preface.
3. Hartle JB (2003) Gravity: An introduction to Einstein's general relativity. San Francisco: Addison-Wesley. 88 p.
4. Arnol'd diffusion in 1½ dimensions. Phys. Rev. Lett;DW Longcope,1987
5. Arnol'd diffusion in two dimensions. Phys. Rev. Lett;H Karimabadi,1989