MathSciNet bibliographic data MR974510 (92f:43004) 43A15 Alspach, Dale E.; Ullrich, David C. Projections onto translation-invariant subspaces of $H\sp 1({\bf R})$$H\sp 1({\bf R})$. Trans. Amer. Math. Soc. 313 (1989), no. 2, 571–588. Article

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