@misc{FeickSiebertDoell2005,
  author    = {Sebastian Feick and Stefan Siebert and Petra D{\"o}ll},
  title     = {A digital global map of artificially drained agricultural areas : documentation},
  booktitle = {Frankfurt hydrology paper ; 4},
  institution = {Geowissenschaften},
  series    = {Frankfurt Hydrology Paper},
  number    = {4},
  type      = {workingpaper},
  year        = {2005},
}