@book { PublicprivatePartnershipimkommunalenBereich,
    title = "Public-private-Partnership im kommunalen Bereich",
    author = "Gerrit {Manssen} and Antje {Himmelreich} and Elena {Gricenko}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02203-2",
    url = "https://www.peterlang.com/document/1046306"
}