@book { StadtumbauOst,
    title = "Stadtumbau Ost",
    author = "Katrin {Junge}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836629980",
    url = "https://m.diplom.de/document/226808"
}