no. 2
Free differentiable S 1 and S 3 actions on homotopy spheres
Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 5 (1972) no. 2, pp. 183-215. 
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     author = {Burghelea, Dan},
     title = {Free differentiable $S^1$ and $S^3$ actions on homotopy spheres},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {183--215},
     publisher = {Elsevier},
     volume = {Ser. 4, 5},
     number = {2},
     year = {1972},
     doi = {10.24033/asens.1224},
     mrnumber = {46 #6380},
     zbl = {0247.57009},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/asens.1224/}
}
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Burghelea, Dan. Free differentiable $S^1$ and $S^3$ actions on homotopy spheres. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 5 (1972) no. 2, pp. 183-215. doi : 10.24033/asens.1224. http://www.numdam.org/articles/10.24033/asens.1224/

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