@book { DieHochschulpolitikdesBerlinerSenats19891997,
    title = "Die Hochschulpolitik des Berliner Senats 1989-1997",
    author = "Rolf {Kohnen}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/217389"
}