@article{PuigSamperRebok2011,
  author    = {Miguel {\´A}ngel Puig-Samper and Sandra Rebok},
  title     = {Charles Darwin and Alexander von Humboldt},
  journal   = {Alexander von Humboldt im Netz ; international review for Humboldtian studies},
  series    = {An exchange of looks between two famous naturalists},
  volume    = {XI},
  number    = {21},
  pages     = {55 -- 64},
  year      = {2011},
}