@article{MZ_1994__217_1_174702,
     author = {R. Niebergall and P.J. Ryan},
     title = {Affine isoparametric hypersurfaces.},
     journal = {Mathematische Zeitschrift},
     pages = {479--486},
     publisher = {mathdoc},
     volume = {217},
     number = {1},
     year = {1994},
     zbl = {0826.53007},
     url = {http://geodesic.mathdoc.fr/item/MZ_1994__217_1_174702/}
}