MathSciNet bibliographic data MR438368 57E15 (57D60 57D65) Davis, M.; Hsiang, W. C. Concordance classes of regular ${\rm U}\sb{n}$${\rm U}\sb{n}$ and ${\rm Sp}\sb{n}$${\rm Sp}\sb{n}$ action on homotopy spheres. Ann. of Math. (2) 105 (1977), no. 2, 325–341. Article

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