@misc{Frahm2006,
  author    = {Jan-Peter Frahm},
  title     = {Zur H{\"o}henzonierung der Cinclidotus-Arten am Rhein},
  booktitle = {15},
  series    = {Archive for Bryology},
  number    = {015},
  type      = {periodicalpart},
  pages     = {3},
  year        = {2006},
}