Hofstadter, Douglas R., 1945-
Gd̲el, Escher, Bach : an eternal golden braid / Douglas R. Hofstadter.
Bach, Johann Sebastian, 1685-1750.
Escher, M. C. (Maurits Cornelis), 1898-1972.
Gd̲el, Kurt
Metamathematics.
Symmetry (Physics)
Artificial intelligence.