@article{10_2307_2661385,
     author = {Karsten Grove and Wolfgang Ziller},
     title = {Curvature and symmetry of {Milnor} spheres},
     journal = {Annals of mathematics},
     year = {2000},
     volume = {152},
     number = {1},
     doi = {10.2307/2661385},
     zbl = {0991.53016},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/2661385/}
}