MathSciNet bibliographic data MR570216 57T20 (53C40) Rigas, A. Geodesic spheres as generators of the homotopy groups of ${\rm O}$${\rm O}$, $B{\rm O}$$B{\rm O}$. J. Differential Geom. 13 (1978), no. 4, 527–545 (1979). Article

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