@book { PactasuntservandaimVerwaltungsvertrag,
    title = "«Pacta sunt servanda» im Verwaltungsvertrag",
    author = "Paula {Macedo Weiss}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1088348"
}