Coxeter obtained Escher's permission to use two of his drawings in his paper "Crystal symmetry and its generalizations"
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Coxeter obtained Escher's permission to use two of his drawings in his paper "Crystal symmetry and its generalizations"
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-17 from Wikipedia. The archived copy is preserved so this citation survives link rot.