MathSciNet bibliographic data MR986683 (91c:43002) 43A15 (46J15) Alspach, Dale E. A characterization of the complemented translation-invariant subspaces of $H\sp 1({\bf R})$$H\sp 1({\bf R})$. Trans. Amer. Math. Soc. 323 (1991), no. 1, 197–207. Article

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