@article{10_4064_cm105_1_13,
     author = {Toshiaki Adachi and Sadahiro Maeda},
     title = {Isoparametric hypersurfaces with
 less than four principal curvatures in a sphere},
     journal = {Colloquium Mathematicum},
     pages = {143--148},
     publisher = {mathdoc},
     volume = {105},
     number = {1},
     year = {2006},
     doi = {10.4064/cm105-1-13},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm105-1-13/}
}