@book{Batsch2006,
  author    = {August J. G. K. Batsch},
  title     = {Continuatio secunda Describens XLIX. Species et Varietates, Totidem Iconibus CLXXXIV - CCXXXII. Repraesentatas},
  url       = {http://caliban.mpiz-koeln.mpg.de/~stueber/batsch/elenchus3/index.html},
  year      = {2006},
}