@article{MZ_1986__191_173698,
     author = {Victor Bangert},
     title = {On the {Lengths} of {Closed} {Geodesics} on {Almost} {Round} {Spheres.}},
     journal = {Mathematische Zeitschrift},
     pages = {549--558},
     publisher = {mathdoc},
     volume = {191},
     year = {1986},
     zbl = {0595.53049},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__191_173698/}
}