@unpublished{GlueckKolovskyKorsch1999,
  author  = {Markus Gl{\"u}ck and Andrey R. Kolovsky and Hans J{\"u}rgen Korsch},
  title   = {Perturbation theory for Wannier resonance states affected by ac fields},
  institution = {Fachbereich Physik},
  year    = {1999},
  url  = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-10159},
}