@book { EinfhrungvonSAPR3imKrankenhaus,
    title = "Einführung von SAP R/3 im Krankenhaus",
    author = "Harald {Maikisch}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832441760",
    url = "https://m.diplom.de/document/219797"
}