@book { PublicPrivatePartnershipsundffentlicheVerschuldung,
    title = "Public Private Partnerships und öffentliche Verschuldung",
    author = "Nicolas {Gatzke}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00383-3",
    url = "https://www.peterlang.com/document/1067398"
}