@article{Luhmann2000,
  author    = {Luhmann, Hans-Jochen},
  title     = {Freiheit f{\"u}r Umweltabgaben},
  journal   = {Umwelt - kommunale {\"o}kologische Briefe},
  number    = {25/26},
  pages     = {23 -- 24},
  year      = {2000},
  language  = {de}
}