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MathSciNet bibliographic data
MR2052192 (2005c:13028) 13J30 (14F40 14P99)
Fernando, José F.; Ruiz, Jesús M.; Scheiderer, Claus Sums of squares in real rings. Trans. Amer. Math. Soc. 356 (2004), no. 7, 2663–2684 (electronic).
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