@book { PublicPrivatePartnershipamBeispielvonstaatlichenMaterialprfanstalten,
    title = "Public Private Partnership am Beispiel von staatlichen Materialprüfanstalten",
    author = "Bastian {Herrmann}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832462772",
    url = "https://m.diplom.de/document/221497"
}