@article{WetterThomas1987,
  author    = {Christof Wetter and S Thomas},
  title     = {Abwasser - Ballast oder Rohstoff?},
  journal   = {Gew{\"a}sserschutz - Wasser - Abwasser (GWA)},
  volume    = {95},
  pages     = {67 -- 81},
  year      = {1987},
}