@book { DiagnosisRelatedGroupsundPflegeaufwand,
    title = "Diagnosis Related Groups und Pflegeaufwand",
    author = "Matthias {Nacke}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832444297",
    url = "https://m.diplom.de/document/220036"
}