Instituto de Ciencias Matemáticas (ICMAT)
Centre/Institute
University of Duisburg-Essen
Essen, AlemaniaPublications in collaboration with researchers from University of Duisburg-Essen (1)
2004
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Sums of squares in real rings
Transactions of the American Mathematical Society, Vol. 356, Núm. 7, pp. 2663-2684