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@article{MAN_1966__165_161438, author = {S. HELGASON}, title = {Totally {Geodesic} {Spheres} in {Compact} {Symmetrie} {Spaces.}}, journal = {Mathematische Annalen}, pages = {309--317}, publisher = {mathdoc}, volume = {165}, year = {1966}, zbl = {0142.19204}, url = {http://geodesic.mathdoc.fr/item/MAN_1966__165_161438/} }
S. HELGASON. Totally Geodesic Spheres in Compact Symmetrie Spaces.. Mathematische Annalen, Tome 165 (1966), pp. 309-317. http://geodesic.mathdoc.fr/item/MAN_1966__165_161438/