@book { AuslnderinderDDR,
    title = "Ausländer in der DDR ",
    author = "Daniel {Meyer}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640617043",
    url = "https://www.hausarbeiten.de/document/150414"
}