@book{Hedwig2006,
  author    = {Johann Hedwig},
  title     = {Descriptio et adumbratio microscopico-analytica muscorum frondosorum nec non aliorum vegetantium e classe cryptogamica Linnaei novorum dubiisque vexatorum},
  url       = {http://caliban.mpiz-koeln.mpg.de/~stueber/hedwig/muscorum/index.html},
  year      = {2006},
}