@book { KrankenhausConsulting,
    title = "Krankenhaus-Consulting",
    author = "Holger {Pusl}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832479510",
    url = "https://m.diplom.de/document/223194"
}