@article{Burgdorf2012state-23419,
  year={2012},
  doi={10.4171/CMH/250},
  title={Pure states, nonnegative polynomials and sums of squares},
  issn={0010-2571},
  journal={Commentarii Mathematici Helvetici},
  pages={113--140},
  author={Burgdorf, Sabine and Scheiderer, Claus and Schweighofer, Markus}
}

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