@misc{SabovljevicFrahm2007,
  author    = {Marko Sabovljevic and Jan-Peter Frahm},
  title     = {Zur Moosflora des K{\"o}nigsforstes bei K{\"o}ln},
  booktitle = {21},
  series    = {Archive for Bryology},
  number    = {021},
  type      = {periodicalpart},
  pages     = {4},
  year        = {2007},
}