@book { Jedermannkannimprovisieren,
    title = "Jedermann kann improvisieren",
    author = "Joe {Degado}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832412517",
    url = "https://m.diplom.de/document/217166"
}