@book{Liebers1999,
  author    = {Klaus Liebers},
  title     = {Physik plus : Kl. 7/8, [Hauptbd.], Sek. 1 Sachsen},
  editor    = {Helmut Mikelskis and Hans-Joachim Wilke},
  isbn      = {3-06-020741-0},
  year      = {1999},
}