@book { DieEUStrukturpolitiknach2006,
    title = "Die EU-Strukturpolitik nach 2006",
    subtitle = "Quo vadis?",
    author = "Stefan {Kienle}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836621199",
    url = "https://m.diplom.de/document/226289"
}