MathSciNet bibliographic data MR238354 57.47 Ku, Hsu-tung; Ku, Mei-chin Free differentiable actions of \$S\sp{1}\$$S\sp{1}$ and \$S\sp{3}\$$S\sp{3}$ on homotopy \$11\$$11$-spheres. Trans. Amer. Math. Soc. 138 1969 223–228. Article

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