@article{GDZPPN002307405,
title = {A Characterization of n-Spheres in Space Forms and Its Complex Analogue.},
journal = {Mathematische Annalen},
volume = {201},
year = {1973},
pages = {75-80},
zbl = {0234.53049},
url = {http://dml.mathdoc.fr/item/GDZPPN002307405}
}
Nomizu, Katsumi. A Characterization of n-Spheres in Space Forms and Its Complex Analogue.. Mathematische Annalen, Tome 201 (1973) pp. 75-80. http://gdmltest.u-ga.fr/item/GDZPPN002307405/