@article{10_4007_annals_2008_168_1011,
     author = {Stefan Immervoll},
     title = {On the classification of isoparametric hypersurfaces with four distinct curvatures in spheres},
     journal = {Annals of mathematics},
     pages = {1011--1024},
     publisher = {mathdoc},
     volume = {168},
     number = {3},
     year = {2008},
     doi = {10.4007/annals.2008.168.1011},
     mrnumber = {2456889},
     zbl = {1176.53057},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2008.168.1011/}
}