@article{01127646, title = {Spherical hypersurfaces with 2-type Gauss map.}, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {39}, year = {1998}, pages = {169-179}, zbl = {0901.53002}, language = {en}, url = {http://dml.mathdoc.fr/item/01127646} }
Chen, Bang-yen; Li, Shijie. Spherical hypersurfaces with 2-type Gauss map.. Beiträge zur Algebra und Geometrie, Tome 39 (1998) pp. 169-179. http://gdmltest.u-ga.fr/item/01127646/