MathSciNet bibliographic data MR587910 (82f:32035) 32H15 (46J15 78A55) Helton, J. William The distance of a function to $H\sp{\infty }$$H\sp{\infty }$ in the Poincaré metric; electrical power transfer. J. Funct. Anal. 38 (1980), no. 2, 273–314. Article

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