16Th International Fall Workshop on Geometry and Physics, Date: 5 September 2007 through 8 September 2007, Location: Lisbon, Patrocinadores: Foundation for Science and Technology (FCT);Cent. Mathematical Anal., Geometry and Dynamical Systems (CAMGSD);Mathematical Physics Group of the University of Lisbon (GFM-UL);Spanish Royal Mathematical Society (RSME)