@book { UntergangimUntergrund,
    title = "Untergang im Untergrund",
    subtitle = "Die jugendliche Gruppe in den Dramen Hans Henny Jahnns",
    author = "Erwin {Jäger}",
    year = "1980",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1072125"
}