@book{Benkner2007,
  author    = {Benkner, Thorsten},
  title     = {Grundlagen des Mobilfunks},
  publisher = {Schlembach},
  address   = {Wilburgstetten},
  isbn      = {978-3-935340-44-1},
  pages     = {IX, 374 S.},
  year      = {2007},
  language  = {de}
}
@book{Hillgaertner2007,
  author    = {Hillg{\"a}rtner, Michael},
  title     = {Hohlraumresonanzg{\"u}te in Modenverwirbelungskammern},
  publisher = {Der Andere Verl.},
  address   = {T{\"o}nning [u.a.]},
  isbn      = {389959679X},
  pages     = {105 S. : Ill., graph. Darst.},
  year      = {2007},
  language  = {de}
}
@book{Lepers2007,
  author    = {Lepers, Heinrich},
  title     = {SPS-Programmierung nach IEC 61131-3 : mit Beispielen f{\"u}r CoDeSys und STEP 7 / 2. Aufl.},
  publisher = {Franzis},
  address   = {Poing},
  isbn      = {978-3-7723-5805-0},
  pages     = {350 S. : Ill., graph. Darst. + 3 CD-ROMs},
  year      = {2007},
  language  = {de}
}