@article{Fernando2004squar-23301,
  year={2004},
  doi={10.1090/S0002-9947-03-03438-X},
  title={Sums of squares in real rings},
  number={07},
  volume={356},
  issn={0002-9947},
  journal={Transactions of the American Mathematical Society},
  pages={2663--2685},
  author={Fernando, José F. and Ruiz, Jesús M. and Scheiderer, Claus}
}

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