@book { KonzeptzurBewertungvoneProcurementInitiativen,
    title = "Konzept zur Bewertung von eProcurement-Initiativen",
    author = "Wolfgang {Huber}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832474591",
    url = "https://m.diplom.de/document/222350"
}