MathSciNet bibliographic data MR2270289 47A13 (06F25 08B20 16W10 46A55 47A63 47N70) Helton, J. William; McCullough, Scott; Putinar, Mihai Strong majorization in a free \$\ast\$$\ast$-algebra. Math. Z. 255 (2007), no. 3, 579–596. Article

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