@book { Stuhlverstopfung,
    title = "Stuhlverstopfung",
    author = "Bernd {Graupner}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832453244",
    url = "https://m.diplom.de/document/220888"
}