@book{Liebers2000,
  author    = {Klaus Liebers},
  title     = {Physik plus : Kl. 7, Arbeitsh., Gymnasium Th{\"u}ringen},
  editor    = {Helmut Mikelskis and Hans-Joachim Wilke},
  isbn      = {3-06-020771-2},
  year      = {2000},
}