@book{Liebers2001,
  author    = {Klaus Liebers},
  title     = {Physik : Kl. 7/8, Arbeitsh., Sekundarschule Sachsen-Anhalt},
  editor    = {Helmut Mikelskis and Hans-Joachim Wilke},
  isbn      = {3-06-020737-2},
  year      = {2001},
}