@phdthesis{Hohberger2007,
  author      = {Horst Hohberger},
  title       = {Semiclassical asymptotics for the scattering amplitude in the presence of focal points at infinity},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Potsdam},
  year        = {2007},
}