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books?id=ZQjBXxxQsucC
books?id=ZQjBXxxQsucC
https://books.google.com/books?id=ZQjBXxxQsucC
Eugenio Beltrami
Hyperbolic geometry
Beltrami equation
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books?id=ZQjBXxxQsucC
https://books.google.com/books?id=ZQjBXxxQsucC