@book{Backhaus2002,
  author    = {Udo Backhaus},
  title     = {Physik plus : Kl. 9/10, [Hauptbd.], Gymnasium Nordrhein-Westfalen},
  editor    = {Helmut Mikelskis and Hans-Joachim Wilke and Lutz-Helmut Sch{\"o}n},
  isbn      = {3-06-020980-4},
  year      = {2002},
}