@unpublished{JunkerSchrohe2008,
  author  = {Wolfgang Junker and Elmar Schrohe},
  title   = {Adiabatic vacuum states on general spacetime manifolds : definition, construction, and physical properties},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2001) 27},
  year    = {2008},
}