@book { DeutscheKurstdteimWandel,
    title = "Deutsche Kurstädte im Wandel",
    author = "Anke {Ziegler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097858"
}