@book { MenschenundStdte,
    title = "Menschen und Städte",
    author = "Gerhard {Fouquet} and Rainer S. {Elkar} and Bernd {Fuhrmann}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01899-8",
    url = "https://www.peterlang.com/document/1046226"
}