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Martin Gardner's Scientific American columns on flexagons helped expand the audience quite a lot.
They've been reprinted along with collections of some of his other columns.
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Conrad & Hartline, Flexagons from 1962.
This paper describes a lot of theory behind how to create and analyze flexagons of various types.
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Various papers from Harold V. McIntosh.
Describes theory behind creating and analyzing flexagons created from different shapes.
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The Flexagon Portal.
Elegant designs on hexaflexagons, dodecaflexagons and more.
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Flexagon Newsgroup on Yahoo!
Contains discussions and announcements on a wide variety of flexagon topics.
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Les Pook's blog on flexagons.
He's also written multiple books about flexagons.
Check out Flexagons Inside Out
and Serious Fun with Flexagons.
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