@book { DieffentlichenFinanzenderEuropischenUnion,
    title = "Die öffentlichen Finanzen der Europäischen Union",
    author = "Carl-Gustav {Siuts}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1092284"
}