Websites
http://enwikipedia.org/wiki/Frieze_group
http://euler.slu.edu/escher/index.php/Frieze_Patterns
http://illuminations.nctm.org/ActivityDetail.aspx?id=168
http://mathdl.maa.org/images/upload_library/4/vol1/architecture/Math/seven.htm
http://mathforum.org/sum95/suzanne/symsusan.html
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