MathSciNet bibliographic data MR971882 (90c:47055) 47B38 (47B20) Cowen, Carl C.; Kriete, Thomas L., III Subnormality and composition operators on \$H\sp 2\$$H\sp 2$. J. Funct. Anal. 81 (1988), no. 2, 298–319. Article

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