@article{Gruening2020,
  author    = {Helmut Gr{\"u}ning},
  title     = {Unser t{\"a}gliches Wasser},
  journal   = {gwf-Wasser und Abwasser},
  volume    = {02 / 161},
  number    = {02 / 2020},
  pages     = {1},
  year      = {2020},
}