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2. Geometry and Islamic Patternshttp://people.exeter.ac.uk/PErnest/ pome24/index.htm
3. The human expression of symmetry: Art and neurosciencehttp://www.ski.org/CWTyler_lab/CWTyler/Art%20Investigations/Symmetry/Symmetry.html
4. Symmetry in Moorish and other ornaments
5. What symmetry groups are present in the Alhambra?;Grnbaum;Not. AMS,2010