@article{Ahrens2003,
  author    = {Matthias Ahrens},
  title     = {Das Laubmoos Fissidens celticus J. A. Paton im Nordschwarzwald},
  journal   = {Carolinea},
  volume    = {61},
  pages     = {33 -- 36},
  doi       = {10.57962/regionalia-19371},
  year      = {2003},
}