@book { BestimmungsgrndedesLnderratings,
    title = "Bestimmungsgründe des Länderratings",
    author = "Roland {Korte}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832418021",
    url = "https://m.diplom.de/document/217658"
}