@book { DasambulanteOperierenimKrankenhaus,
    title = "Das ambulante Operieren im Krankenhaus",
    author = "Frank {Volkmer}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836610018",
    url = "https://m.diplom.de/document/225608"
}