@book { DieEntwicklungeinesgemeinsamenEUKaufrechtsGEK,
    title = "Die Entwicklung eines gemeinsamen EU-Kaufrechts (GEK)",
    author = "Christian {Schultka}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656360360",
    url = "https://www.hausarbeiten.de/document/208612"
}