@article{Buttler2007,
  author    = {Karl Peter Buttler},
  title     = {Erigeron sumatrensis, das Sumatra-Berufkraut, in Frankfurt am Main},
  journal   = {Botanik und Naturschutz in Hessen},
  volume    = {20},
  pages     = {89 -- 96},
  year      = {2007},
}