@book { UnbersichtlicheJugend,
    title = "Unübersichtliche Jugend?",
    author = "Thomas {Schmidt}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434755",
    url = "https://m.diplom.de/document/219141"
}