@book { KompetenzgrenzendesEuGH,
    title = "Kompetenzgrenzen des EuGH",
    author = "Paul {Gragl}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640535460",
    url = "https://www.hausarbeiten.de/document/142597"
}