MathSciNet bibliographic data

MR2034923 (2004m:47026) 47A56 (47A13 47A57) Helton, J. William; McCullough, Scott A.; Putinar, Mihai A non-commutative Positivstellensatz on isometries. J. Reine Angew. Math. 568 (2004), 71--80.

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