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Article Contents
1 Introduction
2 Observed local velocity distribution
3 Effective potential and Jacobi integral
4 Working potential
5 Periodic orbits
6 Liapunov exponents
7 Phase space crowding
8 Changing the initial conditions
9 Resonances and stochasticity
10 $\vec N$-body models
11 Models versus observations
12 Conclusion
References

Copyright ESO 2001
Published by EDP Sciences