@book { AuswirkungenderFinanzmarktkrise2008aufdenMittelstand,
    title = "Auswirkungen der Finanzmarktkrise 2008 auf den Mittelstand",
    author = "Sebastian {Mayer}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842819191",
    url = "https://m.diplom.de/document/228565"
}