@book { PublicPrivatePartnershipinderBundesrepublik,
    title = "Public Private Partnership in der Bundesrepublik",
    author = "Rüdiger {Hintze}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832409975",
    url = "https://m.diplom.de/document/216891"
}