@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/}
}