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@article{MAN_1973__201_162373, author = {Katsumi Nomizu}, title = {A {Characterization} of {n-Spheres} in {Space} {Forms} and {Its} {Complex} {Analogue.}}, journal = {Mathematische Annalen}, pages = {75--80}, publisher = {mathdoc}, volume = {201}, year = {1973}, zbl = {0234.53049}, url = {http://geodesic.mathdoc.fr/item/MAN_1973__201_162373/} }
Katsumi Nomizu. A Characterization of n-Spheres in Space Forms and Its Complex Analogue.. Mathematische Annalen, Tome 201 (1973), pp. 75-80. http://geodesic.mathdoc.fr/item/MAN_1973__201_162373/