@book { SovereignCreditRatinginternationalerRatingAgenturen, title = "Sovereign Credit Rating internationaler Rating-Agenturen", author = "Jörn {Pape}", year = "2011", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783842823266", url = "https://m.diplom.de/document/228713" }