Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{IM_1973__22_142244, author = {J. Levine}, title = {Semi-Free {Circel} {Actions} on {Spheres.}}, journal = {Inventiones mathematicae}, pages = {161--186}, publisher = {mathdoc}, volume = {22}, year = {1973}, zbl = {0266.57010}, url = {http://geodesic.mathdoc.fr/item/IM_1973__22_142244/} }
J. Levine. Semi-Free Circel Actions on Spheres.. Inventiones mathematicae, Tome 22 (1973), pp. 161-186. http://geodesic.mathdoc.fr/item/IM_1973__22_142244/