@article{GDZPPN002091097,
title = {Differentiable S1 Actions on Homotopy Spheres.},
journal = {Inventiones mathematicae},
volume = {27},
year = {1974},
pages = {51-64},
language = {en},
url = {http://dml.mathdoc.fr/item/GDZPPN002091097}
}
Wang, Kai. Differentiable S1 Actions on Homotopy Spheres.. Inventiones mathematicae, Tome 27 (1974) pp. 51-64. http://gdmltest.u-ga.fr/item/GDZPPN002091097/