Here are a few flexagon articles and references:
Dmitry Vasilyev was kind enough to send me a scan of this facinating article on tetra-flexagons that was published about 1970 in the Russian Federation journal: Nauka i Zhizn (Science and Life, Russian: Наука и жизнь). (Click for full scan of pages)
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Flexagon article links:
- Here are some of the best technical articles on the flexagon available, mostly by Dr. McIntosh, and also hosted by Dr. McIntosh.
- Les Pook not only has a facinating website he also has the most comprehensive book on flexagons, "Serious Fun with Flexagons."
- Check out all of the Ann Schwartz flexagon articles here.
- Scott Sherman has the best information on how to make a large variety of flexagon beasts anywhere on the web.