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@article{IM_1992__108_2_144001, author = {John Franks}, title = {Geodesics on {S2} and periodic points of annulus homeomorphisms.}, journal = {Inventiones mathematicae}, pages = {403--418}, publisher = {mathdoc}, volume = {108}, number = {2}, year = {1992}, zbl = {0766.53037}, url = {http://geodesic.mathdoc.fr/item/IM_1992__108_2_144001/} }
John Franks. Geodesics on S2 and periodic points of annulus homeomorphisms.. Inventiones mathematicae, Tome 108 (1992) no. 2, pp. 403-418. http://geodesic.mathdoc.fr/item/IM_1992__108_2_144001/