@article{GDZPPN00229656X, title = {Totally Geodesic Spheres in Compact Symmetrie Spaces.}, journal = {Mathematische Annalen}, volume = {163}, year = {1966}, pages = {309-317}, zbl = {0142.19204}, url = {http://dml.mathdoc.fr/item/GDZPPN00229656X} }
HELGASON, S. Totally Geodesic Spheres in Compact Symmetrie Spaces.. Mathematische Annalen, Tome 163 (1966) pp. 309-317. http://gdmltest.u-ga.fr/item/GDZPPN00229656X/