@misc{Herwig1997,
  author    = {Ingo Herwig},
  title     = {Regelungstechnik zur Magnetschwebekugel},
  url       = {http://sunkist.physik.uni-frankfurt.de/Examen_IH/Welcome.html},
  institution = {Physik},
  type      = {diplom},
  year        = {1997},
}