@book{Linne2006,
  author    = {Carl von Linn{\´e}},
  title     = {Caroli Linnaei ... Flora Zeylanica sistens plantas indicas Zeylonae insulae, quae olim 1670-1677 lectae fuere a Paulo Hermanno ...demum post 70 annos ab Augusto G{\"u}nthero ... orbi redditae; hoc vero opere revisae, examinatae, determinatae et illustratae ...},
  url       = {http://caliban.mpiz-koeln.mpg.de/~stueber/linne/zeylanica/index.html},
  year      = {2006},
}