@book { ImplementierungeinesLieferantenbeurteilungssystems,
    title = "Implementierung eines Lieferantenbeurteilungssystems",
    author = "Matthias {Roßa}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832412272",
    url = "https://m.diplom.de/document/217144"
}