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Berg, C.; Christensen, J. P. R.; Maserick, P. H. Sequences with finitely many negative squares. (English) Zbl 0656.47021 J. Funct. Anal. 79, No. 2, 260-287 (1988). Reviewer: K.Chandrasekhara Rao MSC: 47B37 46C20 PDFBibTeX XMLCite \textit{C. Berg} et al., J. Funct. Anal. 79, No. 2, 260--287 (1988; Zbl 0656.47021) Full Text: DOI