@book { WiedervereinigungundeuropischeIntegration,
    title = "Wiedervereinigung und europäische Integration",
    author = "Hans-Joachim {Brauns}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1077551"
}