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REFERENCES
| C. J. Moreno and S. S. Wagstaff, Jr., Sums of Squares of Integers, Chapman and Hall, 2006, p. 253.
J. Tits, Symmetrie, in Miscellanea mathematica, Springer, Berlin, 1991, pp. 293-304 (see p. 298).
J. Tits, Symmetry, Amer. Math. Monthly 107 (2000), 454-461.
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