http://citation.dbpedia.org/hash2/b33bb0d7b6870ebd233bd774b1da1d250763e8a15b233bd33938c077acc9bc8c
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http://books.google.com/books?vid=ISBN0710607105
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http://books.google.com/books?vid=ISBN9780517103166
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http://books.google.com/books?vid=ISBN1851703241
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http://books.google.com/books?vid=ISBN9781851703241
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http://books.google.com/books?vid=ISBN0517103168
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http://books.google.com/books?vid=ISBN9780710607102
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