@book{kunth_1838, 
  title={Flora berolinensis : sive Enumeratio plantarum circa Berolinum sponte crescentium secundum familias naturales disposita /}, 
  DOI={10.5962/bhl.title.94130}, 
  publisher={Duncker et Humblot,}, 
  author={Kunth}, 
  year={1838}
  }