@article{Luhmann2002,
  author    = {Luhmann, Hans-Jochen},
  title     = {Das Drei-Liter-Geheimnis},
  journal   = {Umwelt - kommunale {\"o}kologische Briefe},
  volume    = {7},
  number    = {13/14},
  pages     = {24 -- 25},
  year      = {2002},
  language  = {de}
}