@book { MietenoderKaufen,
    title = "Mieten oder Kaufen?",
    author = "Anette {Oesert}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832425289",
    url = "https://m.diplom.de/document/218321"
}