@article{Rupke2006,
  author    = {Nicolaas A. Rupke},
  title     = {A Metabiography of Alexander von Humboldt},
  url       = {http://edoc.bbaw.de/oa/articles/re7crvQ6n7Pt2/PDF/23a0ZzBDfmozg.pdf},
  year      = {2006},
}