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URL: http://books.google.com/books?id=R7FjAAAAMAAJ (Google Books. Digitalisiert: 9. Mai 2008, Vorlage: University of Michigan) [G; PDF]
URL: http://books.google.com/books?id=jcL9PiSdU_sC (Google Books. Digitalisiert: 9. Sept. 2005, Vorlage: Harvard University) [G; PDF]