Broglia, Fabrizio
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Francesca Acquistapace,
Fabrizio Broglia,
José F. Fernando,
On Hilbert's 17th problem and Pfister's multiplicative formulae for the ring of real analytic functions,
ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE: 2014: VOL. XIII, ISSUE 2
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