@article{Luhmann2002,
  author    = {Luhmann, Hans-Jochen},
  title     = {Freiheit f{\"u}r Umweltabgaben im Grundgesetz},
  journal   = {Politische {\"O}kologie},
  volume    = {20},
  number    = {77/78},
  pages     = {102 -- 103},
  year      = {2002},
  language  = {de}
}