Ns500:Godel, Escher, Bach
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Hofstadter, Douglas R. (1979). Godel, Escher, Bach: an eternal golden braid. Vintage Book. ISBN 0-394-75682-7.
Hofstadter, Douglas R. (1979). Godel, Escher, Bach: an eternal golden braid. Vintage Book. ISBN 0-394-75682-7.