@article{UhlemannBertelmannMerz2013,
  author    = {S. Uhlemann and Roland Bertelmann and Bruno Merz},
  title     = {Data expansion the potential of grey literature for understanding floods},
  journal   = {Hydrology and earth system sciences : HESS},
  volume    = {17},
  number    = {3},
  pages     = {895 -- 911},
  doi       = {10.5194/hess-17-895-2013},
  year      = {2013},
}