@book { DasProblemderAbwassergebhrenindenneuenBundeslndern,
    title = "Das Problem der Abwassergebühren in den neuen Bundesländern",
    author = "Christoph {Cattien}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086825"
}