@misc{Frahm2011,
  author    = {Jan-Peter Frahm},
  title     = {Erg{\"a}nzungen zur Moosflora von Helgoland},
  booktitle = {115},
  series    = {Archive for Bryology},
  number    = {115},
  type      = {periodicalpart},
  pages     = {5},
  year        = {2011},
}