@book { DieAuenbeziehungenderEuropischenUnion,
    title = "Die Außenbeziehungen der Europäischen Union",
    author = "Franz {Kernic}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1102790"
}