@book { DerKantonJura,
    title = "Der Kanton Jura",
    subtitle = "Ursachen und Schritte zur Lösung eines Schweizer Minderheitenproblems",
    author = "Hans-Joachim {Harder}",
    year = "1978",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1070407"
}