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@article{MAN_1977__226_162948, author = {R.E. Stong}, title = {Free {S1} {Actions.}}, journal = {Mathematische Annalen}, pages = {151--154}, publisher = {mathdoc}, volume = {226}, year = {1977}, url = {http://geodesic.mathdoc.fr/item/MAN_1977__226_162948/} }
R.E. Stong. Free S1 Actions.. Mathematische Annalen, Tome 226 (1977), pp. 151-154. http://geodesic.mathdoc.fr/item/MAN_1977__226_162948/