@article{JRAM_1976__288_151802,
     author = {Shigeo Sasaki},
     title = {Geodesics on the tangent sphere bundles over space forms.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {106--120},
     year = {1976},
     volume = {288},
     zbl = {0333.53031},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__288_151802/}
}