@book { DieDRGSystematikinderdeutschenKrankenhausfinanzierung,
    title = "Die DRG-Systematik in der deutschen Krankenhausfinanzierung",
    author = "Sebastian {Lang}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101218"
}