1. Nicolai, H.: Phys. Lett. 89B, 341 (1980);
2. Nucl. Phys. B176, 419 (1980)
3. Moser, J., Zehnder, E.J.: Notes on Dynamical Systems. Courant Lecture Notes, Vol. 12, Providence, RI: Amer. Math. Soc. 2005
4. Del Debbio L., Panagopoulos H., Vicari E.: JHEP 0208, 044 (2002)
5. Schaefer, S., Sommer, R., Virotta, F.: Investigating the critical slowing down of QCD simulations. Talk given at the XXVII International Symposium on Lattice Field Theory, Beijing, China (July 2009), arXiv:0910.1465 [hep-lat], to appear in the Proceedings