@article{MZ_1990__205_3_174201,
     author = {Jayakumar Ramanathan},
     title = {Minimal hypersurfaces in {S4} with vanishing {Gauss-Kronecker} curvature.},
     journal = {Mathematische Zeitschrift},
     pages = {645--658},
     publisher = {mathdoc},
     volume = {205},
     number = {3},
     year = {1990},
     zbl = {0694.53054},
     url = {http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174201/}
}