@InProceedings{roy:DagSemProc.05021.20,
  author =	{Roy, Marie-Fran\c{c}oise},
  title =	{{Subdiscriminant of symmetric matrices are sums of squares}},
  booktitle =	{Mathematics, Algorithms, Proofs},
  pages =	{1--4},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5021},
  editor =	{Thierry Coquand and Henri Lombardi and Marie-Fran\c{c}oise Roy},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05021.20},
  URN =		{urn:nbn:de:0030-drops-3471},
  doi =		{10.4230/DagSemProc.05021.20},
  annote =	{Keywords: Real algebra, sums of squares, subdiscriminants}
}