@book { Lieferantenauswahl,
    title = "Lieferantenauswahl",
    author = "Jens {Rocholl}",
    year = "2003",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640062355",
    url = "https://www.hausarbeiten.de/document/108031"
}