## Characteristic spheres of free differentiable actions of $S^{1}$ and $S^{3}$ on homotopy spheres

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- by Hsu-tung Ku and Mei-chin Ku PDF
- Trans. Amer. Math. Soc.
**156**(1971), 493-504 Request permission

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## Additional Information

- © Copyright 1971 American Mathematical Society
- Journal: Trans. Amer. Math. Soc.
**156**(1971), 493-504 - MSC: Primary 57.31
- DOI: https://doi.org/10.1090/S0002-9947-1971-0276992-7
- MathSciNet review: 0276992