@article{KoelbelTerkenSauerweinetal.2009,
  author    = {Bernd K{\"o}lbel and Lucie Terken and Martin Sauerwein and Katrin Sauerwein and Steffen K{\"o}lbel},
  title     = {Alexander von Humboldt und seine geognostischen Studien in G{\"o}ttingen},
  volume    = {VII},
  number    = {12},
  pages     = {40 -- 67},
  year      = {2009},
}