@book { RisikoManagementimKrankenhaus,
    title = "Risiko-Management im Krankenhaus",
    author = "Stefan {Ertl}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832493707",
    url = "https://m.diplom.de/document/224465"
}