Classical Billiards in a Magnetic Field and a Potential
  We study billiards in plane domains, with a perpendicular magnetic field and a potential. We give some results on periodic orbits, KAM tori and adiabatic invariants. We also prove the existence of bound states in a related scattering problem. 
N. Berglund, (Institut de Physique Th\'eorique, EPF-Lausanne,   Switzerland)