@misc{Gellenbeck2015,
  author    = {Gellenbeck, Klaus},
  title     = {M{\"u}ll-Handbuch (ESV)},
  isbn      = {978-3-503-09778-4},
  year      = {2015},
  language  = {de}
}
@misc{Gellenbeck2015,
  author    = {Gellenbeck, Klaus},
  title     = {M{\"u}ll-Handbuch (ESV)},
  isbn      = {978-3-503-09778-4},
  year      = {2015},
  language  = {de}
}