@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/