@article{GDZPPN002435829, title = {Constant Curvature 2-spheres in the 4-sphere.}, journal = {Mathematische Zeitschrift}, volume = {199}, year = {1988}, pages = {265-272}, zbl = {0664.53029}, url = {http://dml.mathdoc.fr/item/GDZPPN002435829} }
Ferus, Dirk; Pinkall, Ulrich. Constant Curvature 2-spheres in the 4-sphere.. Mathematische Zeitschrift, Tome 199 (1988) pp. 265-272. http://gdmltest.u-ga.fr/item/GDZPPN002435829/