@book { ZumStudiuminderDDR,
    title = "Zum Studium in der DDR",
    subtitle = "Zwischen Solidaritätsbasar und Kaderschmiede",
    author = "Sandra {Naumann}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836603089",
    url = "https://m.diplom.de/document/228849"
}