@book { ImmobilienLeasingimffentlichenSektor,
    title = "Immobilien-Leasing im öffentlichen Sektor",
    author = "Frank {Roland}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095841"
}