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URN: urn:nbn:de:bvb:12-bsb10218794-4 (BSB, München) [G; PDF]
URL: http://books.google.com/books?id=lOY9AAAAcAAJ (Google Books. Digitalisiert: 4. Sept. 2009, Vorlage: Univ. Gent) [G; PDF]
URL: http://books.google.com/books?id=JKEIAAAAQAAJ (Google Books. Digitalisiert: 11. Juni 2007, Vorlage: Oxford Univ.) [G; PDF]