@book { DieRegionalpolitikderEuropischenGemeinschaft,
    title = "Die Regionalpolitik der Europäischen Gemeinschaft",
    author = "Beatrix {Bursig}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1079464"
}