MathSciNet bibliographic data MR2139727 (2006d:47060) 47B38 (30H05 46J15 47B33) Hosokawa, Takuya; Izuchi, Keiji Essential norms of differences of composition operators on $H\sp \infty$$H\sp \infty$. J. Math. Soc. Japan 57 (2005), no. 3, 669–690. Article

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