@book { DerFderalstaatnachdemBerlinUrteil,
    title = "Der Föderalstaat nach dem Berlin-Urteil",
    author = "Kai A. {Konrad} and Beate {Jochimsen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103226"
}