@book { DasSAPImplementierungsmodellSASPFderBundeswehr,
    title = "Das SAP-Implementierungsmodell SASPF der Bundeswehr",
    author = "Robert {Bölke}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832469566",
    url = "https://m.diplom.de/document/222289"
}