@book { SicherheitsmechanismenalsMarketinginstrument,
    title = "Sicherheitsmechanismen als Marketinginstrument",
    author = "Dirk {Grafe}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832466909",
    url = "https://m.diplom.de/document/222067"
}