@article{IM_1974__24_142269,
     author = {Kai Wang},
     title = {Differentiable {S1} {Actions} on {Homotopy} {Spheres.}},
     journal = {Inventiones mathematicae},
     pages = {51--64},
     year = {1974},
     volume = {24},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM_1974__24_142269/}
}