MathSciNet bibliographic data

MR2179609 (2006i:47028) 47A56 (16S10 47A63) Helton, J. William; McCullough, Scott A.; Putinar, Mihai Non-negative hereditary polynomials in a free $\ast$-algebra. Math. Z. 250 (2005), no. 3, 515--522.

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