"The Ascent of Man" by Jacob Bronowski, Little,
Brown and Company, ISBN 0-316-10930-4,
(1973). See in particular chapter 5, and Figure 67 on page 159, from which the
animations on this web site are inspired.
"The World of Mathematics" by James R. Newman, ed.,
Simon and Schuster, (1956).
Chapter 4, vol. I, pp. 189-192, contains a proof of the theorem due to Euclid.
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