MathSciNet bibliographic data MR573451 57S15 (57S25) Davis, M.; Hsiang, W. C.; Morgan, J. W. Concordance classes of regular ${\rm O}(n)$${\rm O}(n)$-actions on homotopy spheres. Acta Math. 144 (1980), no. 3-4, 153–221. Article

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