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Singer, M. A. Duality in twistor theory without Minkowski space. (English) Zbl 0611.53061 Math. Proc. Camb. Philos. Soc. 98, 591-600 (1985). Reviewer: M.E.Mayer MSC: 53C55 32L05 57R15 PDFBibTeX XMLCite \textit{M. A. Singer}, Math. Proc. Camb. Philos. Soc. 98, 591--600 (1985; Zbl 0611.53061) Full Text: DOI