@book { DieRechtsbeziehungendesHeiligenStuhlszumEuroparat,
    title = "Die Rechtsbeziehungen des Heiligen Stuhls zum Europarat",
    author = "Christoph {Kühn}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1088251"
}