@misc{OesauFrahm2007,
  author    = {Albert Oesau and Jan-Peter Frahm},
  title     = {F{\"u}hrer zu bryologischen Exkursionen, 1. Der Eierfels bei Dorsheim},
  booktitle = {23},
  series    = {Archive for Bryology},
  number    = {023},
  type      = {periodicalpart},
  pages     = {6},
  year        = {2007},
}