@book { ZumMusikerlebenltererMenschen,
    title = "Zum Musikerleben älterer Menschen",
    author = "Frank {Ufermann}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832425395",
    url = "https://m.diplom.de/document/218332"
}