MathSciNet bibliographic data

MR695942 (84m:47046) 47B50 (22E30 47A15) Ball, Joseph A.; Helton, J. William A Beurling\mhy Lax theorem for the Lie group ${\rm U}(m,\,n)$ which contains most classical interpolation theory. J. Operator Theory 9 (1983), no. 1, 107--142.

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