@book { LiberalisierungderWasserversorgung,
    title = "Liberalisierung der Wasserversorgung",
    author = "Nicole {Weiß} and  {Verband kommunaler Unternehmen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097541"
}