@book { DieffentlicheOrdnungnachArt6EGBGBordrepublic,
    title = "Die öffentliche Ordnung nach Art. 6 EGBGB (ordre public)",
    author = "Anni {Kollmann}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640970094",
    url = "https://www.hausarbeiten.de/document/175873"
}