@book { GraduiertenstudiumimUmbruch,
    title = "Graduiertenstudium im Umbruch",
    subtitle = "Ein OECD-Bericht",
    author = "Wolfgang {Mitter} and Ulrich {Schäfer}",
    year = "1991",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1078150"
}