@incollection{Barthel2007,
  author    = {Barthel, Claus},
  title     = {K{\"o}nigsweg sparen: Energiequelle mit Riesenpotenzial},
  booktitle = {Unsere Erde : Schicksal eines Planeten},
  publisher = {Wissen-Media-Verl.},
  address   = {G{\"u}tersloh},
  pages     = {428 -- 431},
  year      = {2007},
  language  = {de}
}